adj · noun · verb · 24 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
Received-Pronunciation:/ˈkɒmplɛks/
Received-Pronunciation:/kəmˈplɛks/
Received-Pronunciation:Recorded audio is listed in the source snapshot.
General-American:kəmplĕks
General-American:kŏm'plĕks
General-American:/kɑmˈplɛks/
General-American:/kəm-/
General-American:/ˈkɑmˌplɛks/
General-American:Recorded audio is listed in the source snapshot.
rhymes with -ɛks
General-American:Recorded audio is listed in the source snapshot.
CMU ARPABET:K AA1 M P L EH0 K S
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
CMU ARPABET 2:K AH0 M P L EH1 K S
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
adj
Meaning 1
Made up of multiple parts; composite; not simple.
Definition source: English Wiktionary via Wiktextract
Examples
a complex being; a complex idea
The human body is a complex system made up of many layers.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
adj
Meaning 2
Not simple, easy, or straightforward; complicated.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Antonyms: basic, easy, simple, simplex, straightforward, as a duck takes to water, easy as 123, easy as ABC, easy as cake, easy as pie, easy as falling off a log, easy as rolling off a log, easy as toffee, easy-breezy, easy peasy, easy peasy Japanesey, easy peasy lemon squeezy, eath, effortless, facile, idiotproof, light, like a duck takes to water, like falling off a log, like riding a bike, like robbing a baby, like shelling peas, like shooting fish in a barrel, like taking candy from a baby, natural, painless, piss-easy, plain-sailing, simple as kiss your hand, smooth, soft, trivial, troublefree, unchallenging, uncomplicated, undemanding, undifficult, yezzy
3
adj
Meaning 3
Having the form a + bi, where a and b are real numbers and i is (by definition) the imaginary square root of −1.
Definition source: English Wiktionary via Wiktextract
Topics: mathematics, sciences
Examples
complex number
function of a complex variable
Meaning relationships
Synonyms: none provided
Antonyms: none provided
4
adj
Meaning 4
Whose range is a subset of the complex numbers.
Definition source: English Wiktionary via Wiktextract
Whose coefficients are complex numbers; defined over the field of complex numbers.
Definition source: English Wiktionary via Wiktextract
Topics: algebra, mathematics, sciences
Examples
complex polynomial
complex algebraic variety
Meaning relationships
Synonyms: none provided
Antonyms: none provided
6
adj
Meaning 6
A curve, polygon or other figure that crosses or intersects itself.
Definition source: English Wiktionary via Wiktextract
Topics: geometry, mathematics, sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
7
noun
Meaning 7
A network of interconnected systems.
Definition source: English Wiktionary via Wiktextract
Examples
military–industrial complex
Meaning relationships
Synonyms: none provided
Antonyms: none provided
8
noun
Meaning 8
A collection of buildings with a common purpose, such as a university or military base.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
9
noun
Meaning 9
An assemblage of related things; a collection.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
10
noun
Meaning 10
An assemblage of related things; a collection.
An organized cluster of thunderstorms.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
11
noun
Meaning 11
An assemblage of related things; a collection.
A cluster of wildfires burning in the same vicinity.
Definition source: English Wiktionary via Wiktextract
Examples
The fire complex began as two separate fires.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
12
noun
Meaning 12
An assemblage of related things; a collection.
A group of closely related species, often distinguished only with difficulty by traditional morphological methods.
Definition source: English Wiktionary via Wiktextract
Topics: biology, natural-sciences, taxonomy
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: species complex, species group, species aggregate
Antonyms: none provided
Narrower terms: species flock, superspecies
13
noun
Meaning 13
A group of emotionally charged ideas or mental factors, unconsciously associated by the individual with a particular subject, arising from repressed instincts, fears, or desires and often resulting in mental abnormality.
Definition source: English Wiktionary via Wiktextract
Topics: human-sciences, psychology, sciences
Examples
Jim has a real complex about working for a woman boss.
Meaning relationships
Synonyms: constellation
Antonyms: none provided
14
noun
Meaning 14
A group of emotionally charged ideas or mental factors, unconsciously associated by the individual with a particular subject, arising from repressed instincts, fears, or desires and often resulting in mental abnormality.
A fixed mental tendency or obsession.
Definition source: English Wiktionary via Wiktextract
Topics: human-sciences, psychology, sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: constellation
Antonyms: none provided
15
noun
Meaning 15
A structure consisting of a central atom or molecule weakly connected to surrounding atoms or molecules, as for example coordination compounds in inorganic chemistry and protein complexes in biochemistry.
Definition source: English Wiktionary via Wiktextract
a compound described in terms of the central atom to which other atoms are bound or coordinated
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: coordination compound
Antonyms: none provided
Broader terms: compound, chemical compound
Narrower terms: hydrochloride
History
Etymology
From French complexe, from Latin complexus, past participle of complector (“to entwine, encircle, compass, infold”), from com- (“together”) and plectō (“to weave, braid”). May be analyzed as com- + -plex. See complect. Doublet of complexus.
Across languages
Translations
243 source translations are retained for this English entry.
Armenian:
խճճված
(xččvac)
— intricate
Armenian:
բարդ
(bard)
— intricate
Bhojpuri:
जटिल
(jaṭil)
— intricate
Bulgarian:
сло́жен
(slóžen)
— intricate
Bulgarian:
съставен
(sǎstaven)
— intricate
Catalan:
complex
— intricate
Chinese Cantonese:
繁複 /繁复
(faan4 fuk1)
— intricate
Chinese Mandarin:
繁複 /繁复
(fánfù)
— intricate
Dutch:
complex
— intricate
Dutch:
ingewikkeld
— intricate
Finnish:
monimutkainen
— intricate
Finnish:
monitahoinen
— intricate
Finnish:
kompleksinen
— intricate
French:
complexe
— intricate
Galician:
complexo
— intricate
Georgian:
რთული
(rtuli)
— intricate
Georgian:
კომპლექსური
(ḳomṗleksuri)
— intricate
Georgian:
ჩახლართული
(čaxlartuli)
— intricate
German:
kompliziert
— intricate
Greek:
πολύπλοκος
(polýplokos)
— intricate
Greek:
περίπλοκος
(períplokos)
— intricate
Ancient Greek:
πολύπλοκος
(polúplokos)
— intricate
Haitian Creole:
konplèks
— intricate
Hawaiian:
hihi
— intricate
Hebrew:
מורכב
(murkav)
— intricate
Hindi:
जटिल
(jaṭil)
— intricate
Hungarian:
komplex
— intricate
Hungarian:
összetett
— intricate
Italian:
complesso
— intricate
Japanese:
入り込んだ
(irikonda)
— intricate
Japanese:
難解な
(nankai na)
— intricate
Northern Kurdish:
aloz
— intricate
Latin:
complicātus
— intricate
Latin:
involūtus
— intricate
Malayalam:
സങ്കീർണ്ണമായ
(saṅkīṟṇṇamāya)
— intricate
Manx:
cramp
— intricate
Māori:
whiwhi
— intricate
Māori:
whīwhiwhi
— intricate
Māori:
pīroiroi
— intricate
Māori:
tuatini
— intricate
Māori:
matatini
— intricate
Occitan:
complèx
— intricate
Old English:
maniġfeald
— intricate
Polish:
skomplikowany
— intricate
Polish:
złożony
— intricate
Portuguese:
complexo
— intricate
Romanian:
complex
— intricate
Russian:
сло́жный
(slóžnyj)
— intricate
Russian:
составно́й
(sostavnój)
— intricate
Scottish Gaelic:
co-thoinnte
— intricate
Scottish Gaelic:
eadar-fhighte
— intricate
Scottish Gaelic:
eadar-fhillte
— intricate
Spanish:
complejo
— intricate
Spanish:
complexo
— intricate
Swedish:
komplex
— intricate
Tagalog:
masalimuot
— intricate
Tahitian:
fifi
— intricate
Telugu:
సంక్లిష్టమైన
(saṅkliṣṭamaina)
— intricate
Thai:
ซับซ้อน
(sáp-sɔ́ɔn)
— intricate
Ukrainian:
складни́й
(skladnýj)
— intricate
Uzbek:
murakkab
— intricate
Arabic:
مَعْقِد
(maʕqid)
— not simple or straightforward
Armenian:
բարդ
(bard)
— not simple or straightforward
Belarusian:
склада́ны
(skladány)
— not simple or straightforward
Bulgarian:
сло́жен
(slóžen)
— not simple or straightforward
Bulgarian:
тру́ден
(trúden)
— not simple or straightforward
Catalan:
complex
— not simple or straightforward
Chinese Cantonese:
複雜 /复杂
(fuk1 zaap6)
— not simple or straightforward
Chinese:
複雜 /复杂
(zh-min-nan)
— not simple or straightforward
Chinese Mandarin:
複雜 /复杂
(fùzá)
— not simple or straightforward
Czech:
komplikovaný
— not simple or straightforward
Dutch:
complex
— not simple or straightforward
Dutch:
ingewikkeld
— not simple or straightforward
Esperanto:
kompleksa
— not simple or straightforward
Esperanto:
malsimpla
— not simple or straightforward
Finnish:
monimutkainen
— not simple or straightforward
Finnish:
vaikeaselkoinen
— not simple or straightforward
French:
complexe
— not simple or straightforward
Galician:
complexo
— not simple or straightforward
Georgian:
რთული
(rtuli)
— not simple or straightforward
Georgian:
ძნელი
(ʒneli)
— not simple or straightforward
German:
kompliziert
— not simple or straightforward
Greek:
πολύπλοκος
(polýplokos)
— not simple or straightforward
Haitian Creole:
konplèks
— not simple or straightforward
Hebrew:
מורכב
(murkav)
— not simple or straightforward
Hindi:
जटिल
(jaṭil)
— not simple or straightforward
Hungarian:
bonyolult
— not simple or straightforward
Indonesian:
rumit
— not simple or straightforward
Italian:
complicato
— not simple or straightforward
Japanese:
複雑
(fukuzatsu)
— not simple or straightforward
Korean:
복잡하다
(bokjaphada)
— not simple or straightforward
Latin:
complex
— not simple or straightforward
Latin:
involūtus
— not simple or straightforward
Macedonian:
сложен
(složen)
— not simple or straightforward
Macedonian:
компликуван
(komplikuvan)
— not simple or straightforward
Malay:
rumit
— not simple or straightforward
Māori:
whiwhi
— not simple or straightforward
Māori:
whīwhiwhi
— not simple or straightforward
Māori:
manganga
— not simple or straightforward
Māori:
matatini
— not simple or straightforward
Māori:
pīroiroi
— not simple or straightforward
Old English:
maniġfeald
— not simple or straightforward
Polish:
skomplikowany
— not simple or straightforward
Polish:
złożony
— not simple or straightforward
Portuguese:
complexo
— not simple or straightforward
Portuguese:
complicado
— not simple or straightforward
Romanian:
complex
— not simple or straightforward
Russian:
сло́жный
(slóžnyj)
— not simple or straightforward
Russian:
тру́дный
(trúdnyj)
— not simple or straightforward
Scottish Gaelic:
co-thoinnte
— not simple or straightforward
Scottish Gaelic:
eadar-fhillte
— not simple or straightforward
Serbo-Croatian:
сложен
— not simple or straightforward
Serbo-Croatian:
složen
— not simple or straightforward
Slovak:
komplikovaný
— not simple or straightforward
Slovene:
zapleten
— not simple or straightforward
Spanish:
complejo
— not simple or straightforward
Spanish:
complexo
— not simple or straightforward
Swedish:
komplex
— not simple or straightforward
Swedish:
komplicerad
— not simple or straightforward
Swedish:
invecklad
— not simple or straightforward
Telugu:
సంక్లిష్టమైన
(saṅkliṣṭamaina)
— not simple or straightforward
Thai:
ซับซ้อน
(sáp-sɔ́ɔn)
— not simple or straightforward
Turkish:
karmaşık
— not simple or straightforward
Ukrainian:
складни́й
(skladnýj)
— not simple or straightforward
Vietnamese:
phức tạp
— not simple or straightforward
Armenian:
կոմպլեքս
(komplekʻs)
— in mathematics
Basque:
konplexu
— in mathematics
Bulgarian:
комплексен
(kompleksen)
— in mathematics
Catalan:
complex
— in mathematics
Chinese Cantonese:
複 /复
(fuk1)
— in mathematics
Chinese Mandarin:
複 /复
(fù)
— in mathematics
Czech:
komplexní
— in mathematics
Danish:
kompleks
— in mathematics
Dutch:
complex
— in mathematics
Esperanto:
kompleksa
— in mathematics
Finnish:
kompleksi-
— in mathematics
French:
complexe
— in mathematics
Galician:
complexo
— in mathematics
Georgian:
კომპლექსური
(ḳomṗleksuri)
— in mathematics
German:
komplex
— in mathematics
Greek:
μιγαδικός
(migadikós)
— in mathematics
Hindi:
समिश्र
(samiśra)
— in mathematics
Hungarian:
komplex
— in mathematics
Italian:
complesso
— in mathematics
Japanese:
複素
(fukuso)
— in mathematics
Polish:
zespolony
— in mathematics
Portuguese:
complexo
— in mathematics
Romanian:
complex
— in mathematics
Russian:
ко́мплексный
(kómpleksnyj)
— in mathematics
Spanish:
complexo
— in mathematics
Swedish:
komplex
— in mathematics
Thai:
เชิงซ้อน
(chəəng-sɔ́ɔn)
— in mathematics
Turkish:
karmaşık
— in mathematics
Ukrainian:
ко́мплексний
(kómpleksnyj)
— in mathematics
Urdu:
مَخْلُوط
(maxlūt)
— in mathematics
Armenian:
համալիր
(hamalir)
— collection of buildings
Bulgarian:
компле́кс
(kompléks)
— collection of buildings
Catalan:
complex
— collection of buildings
Chinese Mandarin:
建築群 /建筑群
(jiànzhùqún)
— collection of buildings
Dutch:
complex
— collection of buildings
Finnish:
kompleksi
— collection of buildings
Finnish:
rakennuskompleksi
— collection of buildings
French:
complexe
— collection of buildings
Galician:
complexo
— collection of buildings
Georgian:
კომპლექსი
(ḳomṗleksi)
— collection of buildings
German:
Komplex
— collection of buildings
Greek:
συγκρότημα
(sygkrótima)
— collection of buildings
Greek:
σύμπλεγμα
(sýmplegma)
— collection of buildings
Hebrew:
קִרְיָה
(qiryá)
— collection of buildings
Hungarian:
komplexum
— collection of buildings
Hungarian:
épületegyüttes
— collection of buildings
Indonesian:
kompleks
— collection of buildings
Irish:
ollionad
— collection of buildings
Italian:
complesso
— collection of buildings
Japanese:
コンプレックス
(konpurekkusu)
— collection of buildings
Malay:
kompleks
— collection of buildings
Malayalam:
സമുച്ചയം
(samuccayaṁ)
— collection of buildings
Manx:
ard-hroggalys
— collection of buildings
Persian:
همتافت
(hamtāft)
— collection of buildings
Polish:
kompleks
— collection of buildings
Portuguese:
complexo
— collection of buildings
Russian:
ко́мплекс
(kómpleks)
— collection of buildings
Spanish:
complejo
— collection of buildings
Swedish:
komplex
— collection of buildings
Ukrainian:
ко́мплекс
(kómpleks)
— collection of buildings
Arabic:
عُقْدَة
(ʕuqda)
— psychologically based dislike or fear
Armenian:
բարդույթ
(barduytʻ)
— psychologically based dislike or fear
Bulgarian:
комплекс
(kompleks)
— psychologically based dislike or fear
Catalan:
complex
— psychologically based dislike or fear
Chinese Mandarin:
情結 /情结
(qíngjié)
— psychologically based dislike or fear
Czech:
komplex
— psychologically based dislike or fear
Finnish:
kompleksi
— psychologically based dislike or fear
French:
complexe
— psychologically based dislike or fear
Galician:
complexo
— psychologically based dislike or fear
German:
Komplex
— psychologically based dislike or fear
Greek:
σύμπλεγμα
(sýmplegma)
— psychologically based dislike or fear
Hindi:
मनोग्रंथि
(manogranthi)
— psychologically based dislike or fear
Hungarian:
komplexus
— psychologically based dislike or fear
Indonesian:
kompleks
— psychologically based dislike or fear
Italian:
complesso
— psychologically based dislike or fear
Japanese:
コンプレックス
(kompurekkusu)
— psychologically based dislike or fear
Korean:
콤플렉스
(kompeullekseu)
— psychologically based dislike or fear
Malay:
kompleks
— psychologically based dislike or fear
Persian:
عقده
(oqde)
— psychologically based dislike or fear
Polish:
kompleks
— psychologically based dislike or fear
Portuguese:
complexo
— psychologically based dislike or fear
Russian:
ко́мплекс
(kómpleks)
— psychologically based dislike or fear
Spanish:
complejo
— psychologically based dislike or fear
Swedish:
komplex
— psychologically based dislike or fear
Ukrainian:
ко́мплекс
(kómpleks)
— psychologically based dislike or fear
Vietnamese:
mặc cảm
— psychologically based dislike or fear
Vietnamese:
phức cảm
— psychologically based dislike or fear
Armenian:
համալիր
(hamalir)
— assemblage of related things, collection
Armenian:
լրակազմ
(lrakazm)
— assemblage of related things, collection
Finnish:
ryhmä
— assemblage of related things, collection
German:
Komplex
— assemblage of related things, collection
Hungarian:
együttes
— assemblage of related things, collection
Hungarian:
összesség
— assemblage of related things, collection
German:
Gewitterkomplex
— thunderstorm that forms when two storm fronts collide
Bulgarian:
комплекс
(kompleks)
— in chemistry
Catalan:
complex
— in chemistry
Chinese Mandarin:
複合物 /复合物
(fùhéwù)
— in chemistry
Estonian:
kompleks
— in chemistry
Finnish:
kompleksi
— in chemistry
French:
complexe
— in chemistry
Galician:
complexo
— in chemistry
German:
Komplex
— in chemistry
Greek:
σύμπλοκο
(sýmploko)
— in chemistry
Indonesian:
kompleks
— in chemistry
Italian:
complesso
— in chemistry
Japanese:
錯体
(sakutai)
— in chemistry
Polish:
kompleks
— in chemistry
Polish:
związek koordynacyjny
— in chemistry
Portuguese:
composto
— in chemistry
Portuguese:
complexo
— in chemistry
Russian:
ко́мплекс
(kómpleks)
— in chemistry
Spanish:
complejo
— in chemistry
Swedish:
komplex
— in chemistry
Bulgarian:
образувам комплекс
(obrazuvam kompleks)
— to form a complex with another substance
Finnish:
kompleksoida
— to form a complex with another substance
Greek:
συμπλέκω
(sympléko)
— to form a complex with another substance
Italian:
complessare
— to form a complex with another substance
Spanish:
complejizar
— to form a complex with another substance