1. [n]  (usually in combination) one of several layers of cloth or paper or wood as in plywood
2. [n]  one of the strands twisted together to make yarn or rope or thread; often used in combination; "three-ply cord"; "four-ply yarn"
3. [v]  use diligently; "ply your wits!"
4. [v]  provide what is desired or needed, esp. support, food or sustenance; "The hostess provided lunch for all the guests"
5. [v]  wield vigorously; "ply an axe"
6. [v]  travel a route regularly; "Ships ply the waters near the coast"
7. [v]  apply oneself diligently; "Ply one's trade"

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1. \Ply\, v. t. [imp. & p. p. {Plied}; p. pr. & vb. n.
   {Plying}.] [OE. plien, F. plier to fold, to bend, fr. L.
   plicare; akin to Gr. ?, G. flechten. Cf. {Apply}, {Complex},
   {Display}, {Duplicity}, {Employ}, {Exploit}, {Implicate},
   {Plait}, {Pliant}, {Flax}.]
   1. To bend. [Obs.]
            As men may warm wax with handes plie. --Chaucer.
   2. To lay on closely, or in folds; to work upon steadily, or
      with repeated acts; to press upon; to urge importunately;
      as, to ply one with questions, with solicitations, or with
      drink.
            And plies him with redoubled strokes  --Dryden.
            He plies the duke at morning and at night. --Shak.
   3. To employ diligently; to use steadily.
            Go ply thy needle; meddle not.        --Shak.
   4. To practice or perform with diligence; to work at.
            Their bloody task, unwearied, still they ply.
                                                  --Waller.
   

2. \Ply\, v. i.
   1. To bend; to yield. [Obs.]
            It would rather burst atwo than plye. --Chaucer.
            The willow plied, and gave way to the gust.
                                                  --L'Estrange.
   2. To act, go, or work diligently and steadily; especially,
      to do something by repeated actions; to go back and forth;
      as, a steamer plies between certain ports.
            Ere half these authors be read (which will soon be
            with plying hard and daily).          --Milton.
            He was forced to ply in the streets as a porter.
                                                  --Addison.
            The heavy hammers and mallets plied.  --Longfellow.
   3. (Naut.) To work to windward; to beat.
   

3. \Ply\, n. [Cf. F. pli, fr. plier. See {Ply}, v.]
   1. A fold; a plait; a turn or twist, as of a cord.
      --Arbuthnot.
   2. Bent; turn; direction; bias.
            The late learners can not so well take the ply.
                                                  --Bacon.
            Boswell, and others of Goldsmith's contemporaries, .
            . . did not understand the secret plies of his
            character.                            --W. Irving.
            The czar's mind had taken a strange ply, which it
            retained to the last.                 --Macaulay.
   Note: Ply is used in composition to designate folds, or the
         number of webs interwoven; as, a three-ply carpet.
   

1. Of a node in a tree, the number of branches between that node and the root.

2. Of a tree, the maximum ply of any of its nodes.