once

I

(New American Roget's College Thesaurus)

adv. formerly, previously, latterly. See time, past. — conj. as soon as, whenever. See time.

II

(Roget's IV) modif.

Syn. a few times, infrequently, not much; see seldom .

modif.

1. [One time]

Syn. 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.

Ant. twice*, many times, frequently.

2. [Formerly]

Syn. long ago, previously, earlier; see formerly .

• at once

3. [Immediately]

Syn. now, quickly, this moment; see immediately .

4. [Simultaneously]

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

• for once,

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

III

(Roget's 3 Superthesaurus)

I

adv.

one time, one time only, never again.

ANT.: repeatedly

II

a.

formerly, previously, in the past, at one time, long ago.

ANT.: currently

IV

(Roget's 3 Superthesaurus) adv.

immediately, now, this instant, *pronto, straightaway, forthwith, posthaste, *before you can say Jack Robinson/Bob's your uncle, *lickety-split.

V

(Roget's Thesaurus II) I adverb At a time in the past: already, before, earlier, erstwhile, formerly, previously. Archaic: aforetime, beforetime. See PRECEDE. II adjective Having been such previously: erstwhile, former, late, old, onetime, past, previous, quondam, sometime, whilom. See PRECEDE.