a. [ OE. one, on, an, AS. ān; akin to D. een, OS. ēn, OFries. ēn, ān, G. ein, Dan. een, Sw. en, Icel. einn, Goth. ains, W. un, Ir. & Gael. aon, L. unus, earlier oinos, oenos, Gr. o'i`nh the ace on dice; cf. Skr. ēka. The same word as the indefinite article a, an. √ 299. Cf. 2d A, 1st An, Alone, Anon, Any, None, Nonce, Only, Onion, Unit. ] 1. Being a single unit, or entire being or thing, and no more; not multifold; single; individual. [ 1913 Webster ]

The dream of Pharaoh is one. Gen. xli. 25. [ 1913 Webster ]

O that we now had here
But one ten thousand of those men in England. Shak. [ 1913 Webster ]

2. Denoting a person or thing conceived or spoken of indefinitely; a certain. “I am the sister of one Claudio” [ Shak. ], that is, of a certain man named Claudio. [ 1913 Webster ]

3. Pointing out a contrast, or denoting a particular thing or person different from some other specified; -- used as a correlative adjective, with or without the. [ 1913 Webster ]

From the one side of heaven unto the other. Deut. iv. 32. [ 1913 Webster ]

4. Closely bound together; undivided; united; constituting a whole. [ 1913 Webster ]

The church is therefore one, though the members may be many. Bp. Pearson [ 1913 Webster ]

5. Single in kind; the same; a common. [ 1913 Webster ]

One plague was on you all, and on your lords. 1 Sam. vi. 4. [ 1913 Webster ]

6. Single; unmarried. [ Obs. ] [ 1913 Webster ]

Men may counsel a woman to be one. Chaucer. [ 1913 Webster ]

☞ One is often used in forming compound words, the meaning of which is obvious; as, one-armed, one-celled, one-eyed, one-handed, one-hearted, one-horned, one-idead, one-leaved, one-masted, one-ribbed, one-story, one-syllable, one-stringed, one-winged, etc. [ 1913 Webster ]

All one, of the same or equal nature, or consequence; all the same; as, he says that it is all one what course you take. Shak. --
One day. (a) On a certain day, not definitely specified, referring to time past. [ 1913 Webster ] One day when Phoebe fair,
With all her band, was following the chase. Spenser. [ 1913 Webster ] (b) Referring to future time: At some uncertain day or period in the future; some day. [ 1913 Webster ] Well, I will marry one day. Shak. [ 1913 Webster ]

n. 1. A single unit; as, one is the base of all numbers. [ 1913 Webster ]

2. A symbol representing a unit, as 1, or i. [ 1913 Webster ]

3. A single person or thing. “The shining ones.” Bunyan. “Hence, with your little ones.” Shak. [ 1913 Webster ]

He will hate the one, and love the other. Matt. vi. 24. [ 1913 Webster ]

That we may sit, one on thy right hand, and the other on thy left hand, in thy glory. Mark x. 37. [ 1913 Webster ]

After one, after one fashion; alike. [ Obs. ] Chaucer. --
At one, in agreement or concord. See At one, in the Vocab. --
Ever in one, continually; perpetually; always. [ Obs. ] Chaucer. --
In one, in union; in a single whole. --
One and one,
One by one, singly; one at a time; one after another. “Raising one by one the suppliant crew.” Dryden. --
one on one contesting an opponent individually; -- in a contest. --
go one on one, to contest one opponent by oneself; -- in a game, esp. basketball. [ 1913 Webster +PJC ]

indef. pron. Any person, indefinitely; a person or body; as, what one would have well done, one should do one's self. [ 1913 Webster ]

It was well worth one's while. Hawthorne. [ 1913 Webster ]

Against this sort of condemnation one must steel one's self as one best can. G. Eliot. [ 1913 Webster ]

One is often used with some, any, no, each, every, such, a, many a, another, the other, etc. It is sometimes joined with another, to denote a reciprocal relation. [ 1913 Webster ] When any one heareth the word. Matt. xiii. 19. [ 1913 Webster ] She knew every one who was any one in the land of Bohemia. Compton Reade. [ 1913 Webster ] The Peloponnesians and the Athenians fought against one another. Jowett (Thucyd. ). [ 1913 Webster ] The gentry received one another. Thackeray. [ 1913 Webster ]

v. t. To cause to become one; to gather into a single whole; to unite; to assimilite. [ Obs. ] [ 1913 Webster ]

The rich folk that embraced and oned all their heart to treasure of the world. Chaucer. [ 1913 Webster ]

n. (Bot.) The herb Paris. See Herb Paris, under Herb. [ 1913 Webster ]

adj. having only one dimension; as, a line is a one-dimensional object; a one-dimensional array. [ WordNet 1.5 +PJC ]

2. Seeming to have only one dimension; lacking depth; as, one-dimensional characters. [ PJC ]

adj. Relating to or having or hearing with only one ear; monaural. Opposite of binaural.
Syn. -- monaural. [ WordNet 1.5 +PJC ]

adj. Having only one sharp edge; single-edged; -- of cutting instruments, mostly swords and razor blades. Opposed to double-edged. [ PJC ]

n. an eightht part.
Syn. -- eighth. [ WordNet 1.5 ]

adj. having or showing only one eye; as, one-eyed Jacks are wild; the three one-eyed Cyclopes of Greek myth. [ WordNet 1.5 ]