[1] : The Collaborative International Dictionary of English v.0.48

once \once\ wu^ns, adv. oe. ones, anes, an adverbial form
   fr. one, on, an, one. see one-, -wards.
   1. for one time; by limitation to the number one; not twice
      nor any number of times more than one.
      1913 webster

            ye shall . . . go round about the city once. --josh.
                                                  vi. 3.
      1913 webster

            trees that bear mast are fruitful but once in two
            years.                                --bacon.
      1913 webster

   2. at some one period of time; -- used indefinitely.
      1913 webster

            my soul had once some foolish fondness for thee.
                                                  --addison.
      1913 webster

            that court which we shall once govern. --bp. hall.
      1913 webster

   3. at any one time; -- often nearly equivalent to ever, if
      ever, or whenever; as, once kindled, it may not be
      quenched.
      1913 webster

            wilt thou not be made clean? when shall it once be?
                                                  --jer. xiii.
                                                  27.
      1913 webster

            to be once in doubt
            is once to be resolved.               --shak.
      1913 webster

   note: once is used as a noun when preceded by this or that;
         as, this once, that once. it is also sometimes used
         elliptically, like an adjective, for once-existing.
         "the once province of britain." --j. n. pomeroy.
         1913 webster

   at once.
      a at the same point of time; immediately; without delay.
          "stand not upon the order of your going, but go at
          once." --shak. "i . . . withdrew at once and
          altogether." --jeffrey.
      b at one and the same time; simultaneously; in one body;
          as, they all moved at once.

   once and again, once and once more; repeatedly. "a dove
      sent forth once and again, to spy." --milton.
      1913 webster
see also:
one- -wards at once once and again 

[2] : The Collaborative International Dictionary of English v.0.48

at \at\, prep. as. aet; akin to ohg. az, goth., os.,  icel.
   at, sw. at, dan.  l. ad.
   primarily, this word expresses the relations of presence,
   nearness in place or time, or direction toward; as, at the
   ninth hour; at the house; to aim at a mark. it is less
   definite than in or on; at the house may be in or near the
   house. from this original import are derived all the various
   uses of at. it expresses: 
   1913 webster

   1. a relation of proximity to, or of presence in or on,
      something; as, at the door; at your shop; at home; at
      school; at hand; at sea and on land.
      1913 webster

   2. the relation of some state or condition; as, at war; at
      peace; at ease; at your service; at fault; at liberty; at
      risk; at disadvantage.
      1913 webster

   3. the relation of some employment or action; occupied with;
      as, at engraving; at husbandry; at play; at work; at meat
      eating; except at puns.
      1913 webster

   4. the relation of a point or position in a series, or of
      degree, rate, or value; as, with the thermometer at
      80deg; goods sold at a cheap price; a country estimated
      at 10,000 square miles; life is short at the longest.
      1913 webster

   5. the relations of time, age, or order; as, at ten o'clock;
      at twenty-one; at once; at first.
      1913 webster

   6. the relations of source, occasion, reason, consequence, or
      effect; as, at the sight; at this news; merry at anything;
      at this declaration; at his command; to demand, require,
      receive, deserve, endure at your hands.
      1913 webster

   7. relation of direction toward an object or end; as, look at
      it; to point at one; to aim at a mark; to throw, strike,
      shoot, wink, mock, laugh at any one.
      1913 webster

   at all, at home, at large, at last, at length, at
   once, etc. see under all, home, large, last phrase
      and syn., length, once, etc.

   at it, busily or actively engaged.

   at least. see least and however.

   at one. see at one, in the vocabulary.
      1913 webster

   syn: in, at.

   usage: when reference to the interior of any place is made
          prominent in is used. it is used before the names of
          countries and cities esp. large cities; as, we live
          in america, in new york, in the south. at is commonly
          employed before names of houses, institutions,
          villages, and small places; as, milton was educated at
          christ's college; money taken in at the customhouse; i
          saw him at the jeweler's; we live at beachville. at
          may be used before the name of a city when it is
          regarded as a mere point of locality. "an english king
          was crowned at paris." --macaulay. "jean jacques
          rousseau was born at geneva, june, 28, 1712." --j.
          morley. in regard to time, we say at the hour, on the
          day, in the year; as, at 9 o'clock, on the morning of
          july 5th, in the year 1775.
          1913 webster
see also:
at all at home at large at last at length at once 
all home large last length 
once at it at least least however 
at one in at 

[3] : WordNet (r) 2.0

at once
     adv 1: without delay or hesitation; with no time intervening; "he
            answered immediately"; "found an answer straightaway";
            "an official accused of dishonesty should be suspended
            forthwith"; "come here now" syn: immediately, instantly,
             straightaway, straight off, directly, now, right
            away, forthwith, in real time, like a shot
     2: simultaneously; "he took three cookies at a time" syn: at
        a time, at one time
see also:
immediately instantly straightaway straight off directly now 
right away forthwith in real time like a shot at a time 
at one time 

[4] : Moby Thesaurus II by Grady Ward, 1.0

81 moby thesaurus words for "at once":
   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

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