noun · 11 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:/ˈfɑːs(t)nəs/
Received-Pronunciation:/ˈfæs(t)-/
Southern-England:Recorded audio is listed in the source snapshot.
General-American:/ˈfæs(t)nəs/
/ˈfɑːs(t)nəs/trap–bath split
rhymes with (Received Pronunciation; trap–bath split) -ɑːstnəs
rhymes with (General American) -æstnəs
CMU ARPABET:F AE1 S T N AH0 S
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
The quality or state of being fast (in various senses).
The quality or state of being strongly attached; firmness, secureness, tenacity.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
noun
Meaning 2
The quality or state of being fast (in various senses).
The quality or state of being strongly attached; firmness, secureness, tenacity.
The ability of a dye to withstand fading.
Definition source: English Wiktionary via Wiktextract
Usage: countable, specifically, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
noun
Meaning 3
The quality or state of being fast (in various senses).
The quality or state of moving quickly; quickness, rapidity, swiftness.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
4
noun
Meaning 4
The quality or state of being fast (in various senses).
The quality or state of having an extravagant lifestyle or immoral habits.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
5
noun
Meaning 5
The quality or state of being fast (in various senses).
Of a fortress or other place: the quality or state of being secure from access or attack; safety, security.
Definition source: English Wiktionary via Wiktextract
Usage: archaic, countable, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
6
noun
Meaning 6
The quality or state of being fast (in various senses).
The quality or state of being firm, hard, or solid; firmness, hardness, solidity.
Definition source: English Wiktionary via Wiktextract
Usage: countable, obsolete, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
7
noun
Meaning 7
Something that is fast, or that causes someone or something to be fast (in various senses).
A fortified or secure place; a fortress, a stronghold.
Definition source: English Wiktionary via Wiktextract
Usage: also, countable, figuratively, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
8
noun
Meaning 8
Something that is fast, or that causes someone or something to be fast (in various senses).
Something used to fasten or tie; a fastener or fastening.
Definition source: English Wiktionary via Wiktextract
Usage: countable, regional, uncountable
Qualifier: obsolete except UK
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
9
noun
Meaning 9
a strongly fortified defensive structure
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
From Middle English fastnes, fastnesse (“immovableness, stability; firmness, solidness; secure attachment; constancy; obstinacy; something giving firmness or strength; of sleep: soundness; of a wound: healing; assurance, confirmation”) [and other forms], from Old English fæstnes (“fastness, firmness, stability; resolution; tenacity; vigour; firmament; fortification”) [and other forms], from fæst (“firm, stable; constant”) (from Proto-Germanic *fastuz (“firm, fixed; secure”); see further at that entry) + -nes (suffix forming abstract nouns denoting a quality or state). The English word may be analysed as fast + -ness.
Across languages
Translations
18 source translations are retained for this English entry.
Turkish:
hızlılık
— quality or state of being fast (in various senses)
Uyghur:
تېزلىك
(tëzlik)
— quality or state of being fast (in various senses)
Uyghur:
ئىلداملىق
(ildamliq)
— quality or state of being fast (in various senses)
Uyghur:
چاپسانلىق
(chapsanliq)
— quality or state of being fast (in various senses)
Uyghur:
ئىتتىكلىك
(ittiklik)
— quality or state of being fast (in various senses)
Italian:
solidità
— ability of a dye to withstand fading
Bulgarian:
укрепление
(ukreplenie)
— fortified or secure place — see also fortress, stronghold
German:
Feste
— fortified or secure place — see also fortress, stronghold
German:
Festung
— fortified or secure place — see also fortress, stronghold
Old Irish:
daingen
— fortified or secure place — see also fortress, stronghold
Manx:
doon
— fortified or secure place — see also fortress, stronghold
Old English:
fæstnes
— fortified or secure place — see also fortress, stronghold
Russian:
цитаде́ль
(citadélʹ)
— fortified or secure place — see also fortress, stronghold
Russian:
кре́пость
(krépostʹ)
— fortified or secure place — see also fortress, stronghold
Russian:
опло́т
(oplót)
— fortified or secure place — see also fortress, stronghold
Russian:
тверды́ня
(tverdýnja)
— fortified or secure place — see also fortress, stronghold
Sanskrit:
कलत्र
(kalatra)
— fortified or secure place — see also fortress, stronghold
Scottish Gaelic:
daingneach
— fortified or secure place — see also fortress, stronghold