Source : Webster's Revised Unabridged Dictionary (1913)

Vibrant \Vi"brant\, a. [L. vibrans, p. pr.: cf. F. vibrant. See
   {Vibrate}.]
   Vibrating; tremulous; resonant; as, vibrant drums.
   --Longfellow.

Source : WordNet®

vibrant
     adj : vigorous and active; "a vibrant group that challenged the
           system"; "a charming and vivacious hostess"; "a
           vivacious folk dance" [syn: {vivacious}]