Synonym: at one time, erst, erstwhile, formerly, in one case, one time. Similar words: at once, concede, concert, concern, concept, all at once, conceive, once more. Meaning: [wʌns] 
adv. 1. on one occasion 2. as soon as 3. at a previous time.
adv. 1. on one occasion 2. as soon as 3. at a previous time. 
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31. Once a use, for ever a custom. 
32. Once a knave, ever a knave.
33. Once a thief, always a thief.
34. Once is no custom.
35. Once bit, twice shy.
36. He that deceives me once, shame fall him, if he deceives me twice, shame fall me.
37. One cannot do a foolish thing once in one's life, but one must hear of it a hundred times.
38. The tiger has once tasted blood is never sated with the taste of it.
39. In the election of a wife, as in a project of war, to err but once is to be undone for ever.
40. He who has done ill once will do it again.
41. Who undertakes many things at once[sentencedict.com], seldom does anything well.
42. The tiger that has once tasted blood is never sated with the taste of it.
43. While the word is in your mouth, it is your own; when 'tis once spoken, 'tis another's.
44. To hear a hundred times is not so good as to see once.
45. The crash of the whole solar and stellar systems could only kill you once.
46. The most utterly lost of all days is that in which you have not once laughed.
47. We only live once, but if we work it right once is enough.
48. I was absent once or twice.
49. The expert in anything was once a beginner.
50. I went sailing once, but I didn't like it.
51. I took the hint and left at once.
52. It is time, once again,(http://sentencedict.com/once.html) to contend with racism.
53. The car sputtered once or twice and then stopped.
54. Once again the talks have ended in deadlock.
55. She determined to go at once.
56. Why is this once, only once in without you.
57. The President fastened on the idea at once.
58. He comes to see us once a week.
59. The receptionist recognized him at once.
60. Regarding John, I will write to him at once.
More similar words: at once, concede, concert, concern, concept, all at once, conceive, once more, conception, concerning, concentrate, once in a while, concentration, once upon a time, concentrating, concrete, conclude, on credit, conclusion, conciliatory, since, hence, fence, cancel, cancer, dancer, stance, glance, chance, bounce.