From Middle English one, oon, on, oan, an, from Old English ān (“one”), from Proto-Germanic *ainaz (“one”), from Proto-Indo-European *óynos (“single, one”). Cognate with Scots ae, ane, wan, yin (“one”); North Frisian ån (“one”); Saterland Frisian aan (“one”); West Frisian ien (“one”); Dutch een, één (“one”); German Low German een; German ein, eins (“one”); Swedish en (“one”); Norwegian Nynorsk ein (“one”), Icelandic einn (“one”); Latin ūnus (“one”) (Old Latin oinos); Russian оди́н (odín).
Use as indefinite personal pronoun influenced by unrelated French on.
- The number represented by the Arabic numeral 1; the numerical value equal to that cardinal number.
- (number theory) The first positive number in the set of natural numbers.
- (set theory) The cardinality of the smallest nonempty set.
- (mathematics) The ordinality of an element which has no predecessor, usually called first or number one.
one (reflexive oneself, possessive adjective one’s, plural ones)
- (impersonal pronoun, indefinite) One thing (among a group of others); one member of a group.
- (impersonal pronoun, sometimes with "the") The first mentioned of two things or people, as opposed to the other.
- (indefinite personal pronoun) Any person (applying to people in general).
- (pronoun) Any person, entity or thing.
one (plural ones)
- The digit or figure 1.
- (mathematics) The neutral element with respect to multiplication in a ring.
- (US) A one-dollar bill.
- (cricket) One run scored by hitting the ball and running between the wickets; a single.
- A joke or amusing anecdote.
- (colloquial) A particularly special or compatible person or thing.
- (Internet slang, leetspeak, sarcastic) Used instead of ! to amplify an exclamation, parodying unskilled typists who forget to press the shift key while typing exclamation points, thus typing "1".
- B: y d0nt u just g0 away l0zer!!1!!one!!one!!eleven!!1!
one (not comparable)
- Of a period of time, being particular.
- Being a single, unspecified thing; a; any.
- Sole, only.
- Whole, entire.
- In agreement.
- The same.
- Being a preeminent example.
- Being an unknown person with the specified name; see also "a certain".
one (third-person singular simple present ones, present participle oning, simple past and past participle oned)
- (obsolete, transitive) To cause to become one; to gather into a single whole; to unite.