Source : Webster's Revised Unabridged Dictionary (1913)

After \Aft"er\, prep.
   1. Behind in place; as, men in line one after another. ``Shut
      doors after you.'' --Shak.

   2. Below in rank; next to in order. --Shak.

            Codrus after Ph?bus sings the best.   --Dryden.

   3. Later in time; subsequent; as, after supper, after three
      days. It often precedes a clause. Formerly that was
      interposed between it and the clause.

            After I am risen again, I will go before you into
            Galilee.                              --Matt. xxvi.
                                                  32.

   4. Subsequent to and in consequence of; as, after what you
      have said, I shall be careful.

   5. Subsequent to and notwithstanding; as, after all our
      advice, you took that course.

   6. Moving toward from behind; following, in search of; in
      pursuit of.

            Ye shall not go after other gods.     --Deut. vi.
                                                  14.

            After whom is the king of Israel come out? --1 Sam.
                                                  xxiv. 14.

   7. Denoting the aim or object; concerning; in relation to;
      as, to look after workmen; to inquire after a friend; to
      thirst after righteousness.

   8. In imitation of; in conformity with; after the manner of;
      as, to make a thing after a model; a picture after Rubens;
      the boy takes after his father.

   {To name} or {call after}, to name like and reference to.

            Our eldest son was named George after his uncle.
                                                  --Goldsmith.

   9. According to; in accordance with; in conformity with the
      nature of; as, he acted after his kind.

            He shall not judge after the sight of his eyes.
                                                  --Isa. xi. 3.

            They that are after the flesh do mind the things of
            the flesh.                            --Rom. viii.
                                                  5.

   10. According to the direction and influence of; in
       proportion to; befitting. [Archaic]

             He takes greatness of kingdoms according to bulk
             and currency, and not after their intrinsic value.
                                                  --Bacon.

   {After all}, when everything has been considered; upon the
      whole.

   {After} (with the same noun preceding and following), as,
      wave after wave, day after day, several or many (waves,
      etc.) successively.

   {One after another}, successively.

   {To be after}, to be in pursuit of in order to reach or get;
      as, he is after money.

Source : WordNet®

one after another
     adv : in single file; "the prisoners came out one by one" [syn: {one
           by one}, {one at a time}]