Source : Webster's Revised Unabridged Dictionary (1913)

Hymn \Hymn\, v. t. [imp. & p. p. {Hymned}; p. pr. & vb. n.
   {Hymning}.] [Cf. L. hymnire, Gr. ?.]
   To praise in song; to worship or extol by singing hymns; to
   sing.

         To hymn the bright of the Lord.          --Keble.

         Their praise is hymned by loftier harps than mine.
                                                  --Byron.

Hymn \Hymn\, v. i.
   To sing in praise or adoration. --Milton.

Hymn \Hymn\, n. [OE. hympne, ympne, F. hymne, OF. also ymne, L.
   hymnus, Gr. ?; perh. akin to ? web, ? to weave, and so to E.
   weave.]
   An ode or song of praise or adoration; especially, a
   religious ode, a sacred lyric; a song of praise or
   thankgiving intended to be used in religious service; as, the
   Homeric hymns; Watts' hymns.

         Admonishing one another in psalms and hymns. --Col.
                                                  iii. 16.

         Where angels first should practice hymns, and string
         Their tuneful harps.                     --Dryden.

   {Hymn book}, a book containing a collection of hymns, as for
      use in churches; a hymnal.

Source : WordNet®

hymn
     n : a song of praise (to God or to a saint or to a nation) [syn:
          {anthem}]

hymn
     v 1: sing a hymn
     2: praise by singing a hymn; "They hymned their love of God"