Source : Webster's Revised Unabridged Dictionary (1913)

All \All\, n.
   The whole number, quantity, or amount; the entire thing;
   everything included or concerned; the aggregate; the whole;
   totality; everything or every person; as, our all is at
   stake.

         Death, as the Psalmist saith, is certain to all.
                                                  --Shak.

         All that thou seest is mine.             --Gen. xxxi.
                                                  43.

   Note: All is used with of, like a partitive; as, all of a
         thing, all of us.

   {After all}, after considering everything to the contrary;
      nevertheless.

   {All in all}, a phrase which signifies all things to a
      person, or everything desired; (also adverbially) wholly;
      altogether.

            Thou shalt be all in all, and I in thee, Forever.
                                                  --Milton.

            Trust me not at all, or all in all.   --Tennyson.

   {All in the wind} (Naut.), a phrase denoting that the sails
      are parallel with the course of the wind, so as to shake.
      

   {All told}, all counted; in all.

   {And all}, and the rest; and everything connected. ``Bring
      our crown and all.'' --Shak.

   {At all}.
   (a) In every respect; wholly; thoroughly. [Obs.] ``She is a
       shrew at al(l).'' --Chaucer.
   (b) A phrase much used by way of enforcement or emphasis,
       usually in negative or interrogative sentences, and
       signifying in any way or respect; in the least degree or
       to the least extent; in the least; under any
       circumstances; as, he has no ambition at all; has he any
       property at all? ``Nothing at all.'' --Shak. ``If thy
       father at all miss me.'' --1 Sam. xx. 6.

   {Over all}, everywhere. [Obs.] --Chaucer.

   Note: All is much used in composition to enlarge the meaning,
         or add force to a word. In some instances, it is
         completely incorporated into words, and its final
         consonant is dropped, as in almighty, already, always:
         but, in most instances, it is an adverb prefixed to
         adjectives or participles, but usually with a hyphen,
         as, all-bountiful, all-glorious, allimportant,
         all-surrounding, etc. In others it is an adjective; as,
         allpower, all-giver. Anciently many words, as, alabout,
         alaground, etc., were compounded with all, which are
         now written separately.

At \At\, prep. [AS. [ae]t; akin to OHG. az, Goth., OS., & Icel.
   at, Sw. [*a]t, 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: 

   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.

   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.

   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.

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

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

   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.

   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.

   {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.

   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.

Source : WordNet®

at all
     adv : in the slightest degree or in any respect; "Are you at all
           interested? No, not at all"; "was not in the least
           unfriendly" [syn: {in the least}, {the least bit}]