n. the diversity (number and variety of species) of plant and animal life within a region
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the diversity of plant and animal life in a particular habitat (or in the world as a whole)
Word Usage
"Perhaps inevitably, such an all-encompassing definition, together with the strong emotive power of the concept, has led to somewhat cavalier use of the term biodiversity, in extreme cases to refer to life or biology itself."