The Collaborative International Dictionary of English v.0.48:
Prolificacy \Pro*lif"ic*a*cy\, n. Prolificness. [R.] [1913 Webster]WordNet (r) 3.0 (2006):
prolificacy n 1: the property of producing abundantly and sustaining vigorous and luxuriant growth; "he praised the richness of the soil"; "weeds lovely in their rankness" [syn: richness, rankness, prolificacy, fertility]