Source : Webster's Revised Unabridged Dictionary (1913)

Vegetate \Veg"e*tate\, v. i. [imp. & p. p. {Vegetated}; p. pr. &
   vb. n. {Vegetating}.] [L. vegetatus, p. p. of vegetare to
   enliven. See {Vegetable}.]
   1. To grow, as plants, by nutriment imbibed by means of roots
      and leaves; to start into growth; to sprout; to germinate.

            See dying vegetables life sustain, See life
            dissolving vegetate again.            --Pope.

   2. Fig.: To lead a live too low for an animate creature; to
      do nothing but eat and grow. --Cowper.

            Persons who . . . would have vegetated stupidly in
            the places where fortune had fixed them. --Jeffrey.

   3. (Med.) To grow exuberantly; to produce fleshy or warty
      outgrowths; as, a vegetating papule.

Source : WordNet®

vegetate
     v 1: lead a passive existence without using one's body or mind
     2: establish vegetation on; "They vegetated the hills behind
        their house"
     3: produce vegetation; "The fields vegetate vigorously"
     4: grow like a plant; "This fungus usually vegetates
        vigorously"
     5: grow or spread abnormally; "warts and polyps can vegetate if
        not removed"
     6: propagate asexually; "The bacterial growth vegetated along"
     7: engage in passive relaxation; "After a hard day's work, I
        vegetate in front of the television" [syn: {vege out}]