The Collaborative International Dictionary of English v.0.48:

Grove \Grove\ (gr[=o]v), n. [AS. graf, fr. grafan to dig. The
   original sense seems to have been a lane cut through trees.
   See Grave, v., and cf. Groove.]
   A smaller group of trees than a forest, and without
   underwood, planted, or growing naturally as if arranged by
   art; a wood of small extent.
   [1913 Webster]

   Note: The Hebrew word Asherah, rendered grove in the
         Authorized Version of the Bible, is left untranslated
         in the Revised Version. Almost all modern interpreters
         agree that by Asherah an idol or image of some kind is
         intended.
         [1913 Webster]

WordNet (r) 3.0 (2006):

grove
    n 1: a small growth of trees without underbrush
    2: garden consisting of a small cultivated wood without
       undergrowth [syn: grove, woodlet, orchard,
       plantation]