adj · adv · character · name · noun · num · symbol · verb · 35 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.
Singapore:/siː(˦)/
letter, name:/siː/
UK:Recorded audio is listed in the source snapshot.
US:Recorded audio is listed in the source snapshot.
1995, Gary Wolf, "The Curse of Xanadu", Wired Magazine The PDP-11, from the Digital Equipment Corporation, was a coveted machine. It was the original computer to run a new programming language called C, which was on its way to becoming the hackers' standard. Gregory, as it happened, didn't have any spare PDP-11s at his disposal. But the repairman took the opportunity to question some of Nelson's blithe predictions in Computer Lib, and Nelson, in response, unleashed his glib and bitter tirade against the conservative ignoramuses in the computer business.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
5
name
Meaning 5
Head of the Secret Intelligence Service (MI6).
Definition source: English Wiktionary via Wiktextract
Usage: UK
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
6
name
Meaning 6
Symbol for the company Citigroup Inc. on the NYSE.
Definition source: English Wiktionary via Wiktextract
Usage: alt-of, symbol
Topics: business, finance, stock-ticker-symbol
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
7
noun
Meaning 7
Alternative form of c..
Definition source: English Wiktionary via Wiktextract
Usage: alt-of, alternative
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
8
noun
Meaning 8
The middle tone in either one of the sets of seven white keys on a keyboard or a set of seven strings on a stringed instrument.
Definition source: English Wiktionary via Wiktextract
Topics: entertainment, lifestyle, music
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
9
noun
Meaning 9
One hundred dollars; a c-note.
Definition source: English Wiktionary via Wiktextract
Usage: US, slang
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
10
noun
Meaning 10
The first note in the C chromatic and major scales.
Definition source: English Wiktionary via Wiktextract
Topics: entertainment, lifestyle, music
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
11
noun
Meaning 11
An academic grade better than a D and worse than a B.
Definition source: English Wiktionary via Wiktextract
Topics: education
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
12
noun
Meaning 12
Canonical Decomposition, followed by Canonical Composition
Definition source: English Wiktionary via Wiktextract
Qualifier: Unicode
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
13
noun
Meaning 13
Cocaine.
Definition source: English Wiktionary via Wiktextract
Usage: slang
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
14
noun
Meaning 14
Cunt.
Definition source: English Wiktionary via Wiktextract
Usage: slang, vulgar
Examples
1977-1980, Lou Sullivan, personal diary, quoted in 2019, Ellis Martin, Zach Ozma (editors), We Both Laughed In Pleasure He turned me on my stomach & slowly gently put his cock in my ass. I was so happy! But I was having a hard time completely relaxing & so he withdrew & went in my C.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
15
noun
Meaning 15
Abbreviation of consonant.
Definition source: English Wiktionary via Wiktextract
Usage: abbreviation, alt-of
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
16
noun
Meaning 16
Abbreviation of Conservative.
Definition source: English Wiktionary via Wiktextract
Usage: UK, abbreviation, alt-of
Topics: government, politics
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
17
noun
Meaning 17
Abbreviation of century.
Definition source: English Wiktionary via Wiktextract
Usage: abbreviation, alt-of
Examples
Symbolism was a 19C literary and artistic movement.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
18
noun
Meaning 18
Abbreviation of center.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
19
noun
Meaning 19
Abbreviation of costa.
Definition source: English Wiktionary via Wiktextract
Usage: abbreviation, alt-of
Topics: biology, entomology, natural-sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
20
num
Meaning 20
The third numeral symbol of the English alphabet, called cee and written in the Latin script.
Definition source: English Wiktionary via Wiktextract
Usage: lowercase
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
21
symbol
Meaning 21
A standard size of dry cell battery between A and D.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
22
verb
Meaning 22
Abbreviation of see.
Definition source: English Wiktionary via Wiktextract
Usage: Internet, abbreviation, alt-of
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
23
adjective satellite
Meaning 23
being ten more than ninety
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: hundred, one hundred, 100
Antonyms: none provided
24
noun
Meaning 24
street names for cocaine
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: coke, blow, nose candy, snow
Antonyms: none provided
Broader terms: cocaine, cocain
25
noun
Meaning 25
the 3rd letter of the Roman alphabet
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: letter, letter of the alphabet, alphabetic character
26
noun
Meaning 26
(music) the keynote of the scale of C major
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: tonic, keynote
27
noun
Meaning 27
a general-purpose programing language closely associated with the UNIX operating system
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: programming language, programing language
28
noun
Meaning 28
a unit of electrical charge equal to the amount of charge transferred by a current of 1 ampere in 1 second
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: coulomb, ampere-second
Antonyms: none provided
Broader terms: charge unit, quantity unit
29
noun
Meaning 29
a degree on the centigrade scale of temperature
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: degree centigrade, degree Celsius
Antonyms: none provided
Broader terms: degree
Narrower terms: standard temperature
30
noun
Meaning 30
ten 10s
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: hundred, 100, century, one C
Antonyms: none provided
Broader terms: large integer
31
noun
Meaning 31
an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
a base found in DNA and RNA and derived from pyrimidine; pairs with guanine
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: cytosine
Antonyms: none provided
Broader terms: pyrimidine
33
noun
Meaning 33
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: deoxycytidine monophosphate
Antonyms: none provided
Broader terms: nucleotide, base
34
noun
Meaning 34
a vitamin found in fresh fruits (especially citrus fruits) and vegetables; prevents scurvy
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: vitamin C, ascorbic acid
Antonyms: none provided
Broader terms: antioxidant, water-soluble vitamin
35
noun
Meaning 35
the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: speed of light, light speed
Antonyms: none provided
Broader terms: constant, speed, velocity
History
Etymology
Uncertain. Either from Hainanese 鮮 /鲜 (si23, “fresh”), short for 鮮奶 (“fresh milk”), Malay cair (“melted”) referring to evaporated milk, or an abbreviation of Carnation, a canned milk brand, and historically, one of the most widespread forms of evaporated milk in Singapore.
Abbreviations.
Old English lower case letter c, from 7th century replacement by Latin lower case c of the Anglo-Saxon Futhorc letter ᚳ (c, “cen”).
The programming language is so named because it followed on from an earlier language called B.
Across languages
Translations
59 source translations are retained for this English entry.
Arabic:
سي
(sī)
— programming language
Aragonese:
C
— programming language
Aragonese:
luengache de programación C
— programming language
Armenian:
Սի
— programming language
Armenian:
C
— programming language
Asturian:
C
— programming language
Asturian:
llinguaxe de programación C
— programming language
Azerbaijani:
C
— programming language
Belarusian:
C
— programming language
Buginese:
C
— programming language
Bulgarian:
C
— programming language
Chinese Cantonese:
C語言 /C语言
(si1 jyu5 jin4)
— programming language
Eastern Min Chinese:
C
— programming language
Eastern Min Chinese:
C ngṳ̄-ngiòng
— programming language
Chinese Mandarin:
C語言 /C语言
(sèi-yǔyán)
— programming language