WordReference Random House Learner's Dictionary of American English © 2017
once /wʌns/USA pronunciation   adv. 
  1. formerly:a once powerful nation.
  2. a single time:We eat out once a week.
  3. at any time;
    ever:If the facts once became known, we'd be in trouble.
  4. by a single step, degree, or grade:She's my first cousin once removed.

n. [uncountable]
  1. a single occasion;
    one time only:Once is enough.

conj. 
  1. if or when at any time;
    if ever:Once the news is out, they'll hunt us down.
  2. whenever;
    as soon as:Once you're finished, you can leave.

adj. 
  1. former;
    one-time:the once and future king.
Idioms
  1. Idiomsall at once, suddenly:All at once it started to rain.
  2. Idiomsat once: 
    • immediately;
      promptly:left at once.
    • at the same time;
      simultaneously:They all sprang up at once.
  3. Idiomsonce (and) for all, decisively;
    finally:Let's settle this argument once and for all.
  4. Idiomsonce in a while, sometimes;
    occasionally.
  5. Idiomsonce or twice, a very few times;
    not frequently:I've only seen her once or twice.
  6. Idiomsonce upon a time, (used as an opening phrase to give the setting for a fairy tale or similar story in the distant, imaginary past):Once upon a time there was a giant.


WordReference Random House Unabridged Dictionary of American English © 2017
once  (wuns),USA pronunciation adv. 
  1. at one time in the past;
    formerly:I was a farmer once; a once powerful nation.
  2. a single time:We ate there just once. We go to a movie once a week.
  3. even a single time;
    at any time;
    ever:If the facts once become known, it will be just too bad.
  4. by a single step, degree, or grade:a cousin once removed.
  5. Idiomsonce and again, repeatedly:He has been told once and again not to slam the door.
  6. Idiomsonce and for all, decisively;
    finally:Let's settle this problem once and for all.Also,  once for all. 
  7. Idiomsonce in a while, at intervals;
    occasionally:She stops in to see us once in a while.
  8. Idiomsonce or twice, a very few times;
    infrequently:I've seen her in the elevator once or twice.
  9. Idiomsonce upon a time, at some unspecified past time, esp. a long time ago:Once upon a time, in a faraway land, there lived a prince and princess.

adj. 
  1. former;
    having at one time been:the once and future king.

conj. 
  1. if or when at any time;
    if ever.
  2. whenever;
    as soon as:Once you're finished, you can leave.

n. 
  1. a single occasion;
    one time only:Once is enough.
  2. Idiomsall at once: 
    • simultaneously:The children were running, screaming, and throwing things all at once.
    • suddenly:All at once the rain came down.
  3. Idiomsat once: 
    • at the same time;
      simultaneously:Don't all speak at once.
    • immediately;
      promptly:Tell him to come at once!
  • bef. 1150; Middle English ones, Old English ānes, origin, originally genitive of ān one; replacing Middle English enes, Old English ǣnes once, equivalent. to ǣne once (origin, originally instrumental of ān) + -es adverb, adverbial suffix; see -s1


Collins Concise English Dictionary © HarperCollins Publishers::

once /wʌns/ adv
  1. one time; on one occasion or in one case
  2. at some past time; formerly: I could speak French once
  3. by one step or degree (of relationship): a cousin once removed
  4. (in conditional clauses, negatives, etc) ever; at all: if you once forget it
  5. multiplied by one
  6. once and awayconclusively
  7. occasionally
  8. once and for allconclusively; for the last time
  9. once in a whileoccasionally; now and then
  10. once or twice, once and againa few times
  11. once upon a timeused to begin fairy tales and children's stories
conj
  1. (subordinating) as soon as; if ever or whenever
n
  1. one occasion or case: you may do it, this once
  2. all at oncesuddenly or without warning
  3. simultaneously
  4. at onceimmediately
  5. simultaneously
  6. for oncethis time, if (or but) at no other time
Etymology: 12th Century ones, ānes, adverbial genitive of on, ān one



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