/ˌbīōdiˈvərsitē/
Noun, pl. biodiversities
1. The degree of variation of life forms within a given species, ecosystem, biome, or planet. (wikipedia.org)
2. (Biology)
The diversity (number and variety of species) of plant and animal life within a region. (wiktionary.org)
3. The existence of a wide range of different types of organisms in a given place at a given time. The diversity of plant and animal life in a particular habitat (or in the world as a whole); a high level of biodiversity is desirable.Pertaining to the diversity and frequency of organisms in a given area. (biology-online.org)
Word origin: bio + diversity