at once
adverb
1 at once
Without delay or hesitation; with no time intervening.
synonyms: directly, forthwith, immediately, instantly, like a shot, now, right away, straight off, straightaway.
Roget 113:
instantaneously
etc.
adj.;
in no time,
in less than no time;
presto,
subito†,
instanter,
suddenly,
at a stroke,
like a shot;
in a moment
etc.
n..
in the blink of an eye,
in the twinkling of an eye,
in a trice;
in one's tracks;
right away;
toute a l'heure [Fr.];
at one jump,
in the same breath,
per saltum [Lat.],
uno saltu [Lat.];
at once,
all at once;
plump,
slap;
at one fell swoop;"
at the same instant
etc.
n.;
immediately
etc.
(early)
132;
extempore,
on the moment,
on the spot,
on the spur of the moment;
no sooner said than done;
just then;
slap-dash
etc.
(haste)
684.
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Roget 132:
early,
soon,
anon,
betimes,
rath†;
eft,
eftsoons;
ere long,
before long,
shortly;
beforehand;
prematurely
etc.
adj.;
precipitately
etc.
(hastily)
684;
too soon;
before its time,
before one's time;
in anticipation;
unexpectedly
etc.
508.
suddenly
etc.
(instantaneously)
113;
before one can say 'Jack Robinson',"
at short notice,
extempore;
on the spur of the moment,
on the spur of the occasion
[Bacon];
at once;
on the spot,
on the instant;
at sight;
offhand,
out of hand;
a' vue d'oeil [Fr.];
straight,
straightway,
straightforth†;
forthwith,
incontinently,
summarily,
immediately,
briefly,
shortly,
quickly,
speedily,
apace,
before the ink is dry,
almost immediately,
presently at the first opportunity,
in no long time,
by and by,
in a while,
directly.
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2 at once
Moby thesaurus: PDQ, all at once, all together, amain, apace, as one, at a blow, at a stroke, at one blow, at one jump, at one stroke, at one swoop, at one time, by forced marches, coincidentally, coinstantaneously, concurrently, conjointly, corporately, cursorily, decisively, directly, expeditiously, feverishly, forthwith, furiously, hand over fist, hastily, helter-skelter, hotfoot, hurriedly, hurry-scurry, immediately, in a hurry, in agreement, in common, in concord, in no time, in partnership, in passing, in unison, inharmony, instanter, instantly, jointly, mutually, now, on the instant, on the run, on the spot, pell-mell, per saltum, pretty damned quick, promptly, pronto, quickly, right away, right now, right off, simultaneously, slapdash, smartly, speedily, straightaway, straightway, subito, summarily, superficially, swiftly, then and there, this minute, this very minute, together, uno saltu, with a rush, with all haste, with all speed, with dispatch, with haste, without delay, without further delay ... show more.
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