Facultative

[fa-kəl-ˌtā-tiv]
Part of speech: adjective
  • Dealing with permissions and the granting of them
  • Happening in some circumstances but not all

About Facultative

In biology, the word facultative describes traits in plants and animals that are considered optional. For example, facultative carnivores are those that can survive on non-animal foods when necessary.

Reposted from Word Genius. 

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