Once(adv.) By limitation to the number one; for one time; not twice nor any number of times more than one.
Once(adv.) At some one period of time; -- used indefinitely.
Once(adv.) At any one time; -- often nearly equivalent to ever, if ever, or whenever; as, once kindled, it may not be quenched.

Words within onces

5 letter words: 5 results
4 letter words: 16 results
3 letter words: 22 results
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