Source : Webster's Revised Unabridged Dictionary (1913)

Fill \Fill\, v. t. [imp. & p. p. {Filled}; p. pr. & vb. n.
   {Filling}.] [OE. fillen, fullen, AS. fyllan, fr. full full;
   akin to D. vullen, G. f["u]llen, Icel. fylla, Sw. fylla, Dan.
   fylde, Goth. fulljan. See {Full}, a.]
   1. To make full; to supply with as much as can be held or
      contained; to put or pour into, till no more can be
      received; to occupy the whole capacity of.

            The rain also filleth the pools.      --Ps. lxxxiv.
                                                  6.

            Jesus saith unto them, Fill the waterpots with
            water. Anf they filled them up to the brim. --John
                                                  ii. 7.

   2. To furnish an abudant supply to; to furnish with as mush
      as is desired or desirable; to occupy the whole of; to
      swarm in or overrun.

            And God blessed them, saying. Be fruitful, and
            multiply, and fill the waters in the seas. --Gen. i.
                                                  22.

            The Syrians filled the country.       --1 Kings xx.
                                                  27.

   3. To fill or supply fully with food; to feed; to satisfy.

            Whence should we have so much bread in the
            wilderness, as to fillso great a multitude? --Matt.
                                                  xv. 33.

            Things that are sweet and fat are more filling.
                                                  --Bacon.

   4. To possess and perform the duties of; to officiate in, as
      an incumbent; to occupy; to hold; as, a king fills a
      throne; the president fills the office of chief
      magistrate; the speaker of the House fills the chair.

   5. To supply with an incumbent; as, to fill an office or a
      vacancy. --A. Hamilton.

   6. (Naut.)
      (a) To press and dilate, as a sail; as, the wind filled
          the sails.
      (b) To trim (a yard) so that the wind shall blow on the
          after side of the sails.

   7. (Civil Engineering) To make an embankment in, or raise the
      level of (a low place), with earth or gravel.

   {To fill in}, to insert; as, he filled in the figures.

   {To fill out}, to extend or enlarge to the desired limit; to
      make complete; as, to fill out a bill.

   {To fill up}, to make quite full; to fill to the brim or
      entirely; to occupy completely; to complete. ``The bliss
      that fills up all the mind.'' --Pope. ``And fill up that
      which is behind of the afflictions of Christ.'' --Col. i.
      24.

Filling \Fill"ing\, n.
   1. That which is used to fill a cavity or any empty space, or
      to supply a deficiency; as, filling for a cavity in a
      tooth, a depression in a roadbed, the space between
      exterior and interior walls of masonry, the pores of
      open-grained wood, the space between the outer and inner
      planks of a vessel, etc.

   2. The woof in woven fabrics.

   3. (Brewing) Prepared wort added to ale to cleanse it.

   {Back filling}. (Arch.) See under {Back}, a.

Source : WordNet®

filling
     n 1: any material that fills a space or container; "there was not
          enough fill for the trench" [syn: {fill}]
     2: flow into something (as a container)
     3: (dentistry) a dental appliance consisting of any of various
        substances (as metal or plastic) inserted into a prepared
        cavity in a tooth; "when he yawned I could see the gold
        fillings in his teeth"; "an informal British term for
        `filling' is `stopping'"
     4: a food mixture used to fill pastry or sandwiches etc.
     5: the yarn woven across the warp yarn in weaving [syn: {woof},
         {weft}, {pick}]
     6: the act of filling something