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Synonyms for once

modified

  1. One time

    this time, but once, once only, one time before, already, one, just this once, for the nonce, not more than once, never again, a single time, one time previously, on one occasion, only one time.

    Antonyms twice*, many times, frequently.

  2. Formerly

    long ago, previously, earlier; see formerly.

at once
  1. Immediately

    now, quickly, this moment; see immediately.

  2. Simultaneously

    all at once, at the same time, concurrently; see together 2.

for once

for at least one time, once only, uniquely; see once 1.

See once in Webster's New World Roget's A-Z Thesaurus II

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