Source : Webster's Revised Unabridged Dictionary (1913)

Foliage \Fo"li*age\, n. [OF. foillage, fueillage, F. feuillage,
   fr. OF. foille, fueille, fueil, F. feulle, leaf, L. folium.
   See 3d {Foil}, and cf. {Foliation}, {Filemot}.]
   1. Leaves, collectively, as produced or arranged by nature;
      leafage; as, a tree or forest of beautiful foliage.

   2. A cluster of leaves, flowers, and branches; especially,
      the representation of leaves, flowers, and branches, in
      architecture, intended to ornament and enrich capitals,
      friezes, pediments, etc.

   {Foliage plant} (Bot.), any plant cultivated for the beauty
      of its leaves, as many kinds of {Begonia} and {Coleus}.

Foliage \Fo"li*age\, v. t.
   To adorn with foliage or the imitation of foliage; to form
   into the representation of leaves. [R.] --Drummond.

Source : WordNet®

foliage
     n 1: the main organ of photosynthesis and transpiration in higher
          plants [syn: {leaf}, {leafage}]
     2: (architecture) leaf-like architectural ornament [syn: {foliation}]