Synonym: 1, I, ace, ane, i, matchless, nonpareil, one and only, one, peerless, single, unitary, unity, unmatchable, unmatched, unrivaled, unrivalled. Similar words: done, on, once, tone, zone, on end, age, and. Meaning: [wʌn] 
n. 1. the smallest whole number or a numeral representing this number 2. a single person or thing. adj. 1. used of a single unit or thing; not two or more 2. having the indivisible character of a unit 3. of the same kind or quality 4. used informally as an intensifier 5. indefinite in time or position 6. being a single entity made by combining separate components 7. eminent beyond or above comparison.
n. 1. the smallest whole number or a numeral representing this number 2. a single person or thing. adj. 1. used of a single unit or thing; not two or more 2. having the indivisible character of a unit 3. of the same kind or quality 4. used informally as an intensifier 5. indefinite in time or position 6. being a single entity made by combining separate components 7. eminent beyond or above comparison. 
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241. If you would have a good wife, marry one who has been a good daughter. Thomas Fuller 
242. One may overcome a thousand men in battle, but he who conquers himself is the greatest victor.
243. No one can be perfectly free till all are free; no one can be perfectlymoral till all are moral; no one can be perfectly happy till all are happy.
244. Do not, for one repulse, forgo the purpose that you resolved to effort.
245. The shortest way to do many things is to do only one thing at a time.
246. One thorn of experience is worth a whole wilderness of warning.
247. A little credulity helps one on through life very smoothly.
248. Miracles sometimes occur, but one has to work terribly for them.
249. Everything can be taken from a man but one thing; the freedom to choose his attitude in any given set of circumstances.
250. If two men ride on a horse, one must ride behind.
251. One crowded hour of glorious life is worth an age without a name.
252. The maintaining of one vice costs more than ten virtues.
253. It is one thing to speak much and another to speak pertinently.
254. He who blames one to his face is a hero(sentencedict.com), but he who backbites is a coward.
255. One cannot make a silk purse out of a sow's ear.
256. She's a great one for idle gossip .
257. Add one heaped tablespoon of salt.
258. The athlete will have one final fling before retirement.http://Sentencedict.com
259. To my one and only Valentine: I love you.
260. Knowledge is one thing, virtue is another.
261. It's no more than one mile to the shops.
262. We agreed the proposal was a good one.
263. It's one of those old Hollywood epics with a cast of thousands.
264. The day after Christmas is generally a busy one for retailers.
265. Bees pollinate the plants by carrying the pollen from one flower to another.
266. It has been estimated that one in eight couples is infertile.
267. As a footnote, I should add that there was one point on which his bravado was more than justified.
268. There is one particular patient I'd like you to see.
269. The swinging door is pivoted on one side; the revolving door is pivoted in the centre.
270. He failed to mention that he was the one who started the fight.