The Collaborative International Dictionary of English v.0.48:
Luxuriance \Lux*u"ri*ance\, n. [Cf. F. luxuriance.] The state or quality of being luxuriant; rank, vigorous growth; excessive abundance produced by rank growth. "Tropical luxuriance." --B. Taylor. [1913 Webster]WordNet (r) 3.0 (2006):
luxuriance n 1: the property of being lush and abundant and a pleasure to the senses [syn: luxuriance, lushness, voluptuousness]