Confused and have questions? We’ve got answers. With Chegg Study, you can get step-by-step solutions to your questions from an expert in the field. If you rather get 1:1 study help, try 30 minutes of free online tutoring with Chegg Tutors.


From Biology-Online Dictionary | Biology-Online Dictionary
Jump to: navigation, search



(1) Not compulsory; not restricting.

(2) Of, or relating to, mental faculty.

(biology) Capable of existing to more than one set of (environmental) conditions or by assuming various behaviors.


For example, facultative bacteria can thrive in both aerobic and anaerobic environments.

Word origin: NL facultātīvus.
Related forms: facultatively (adjective).

Compare: obligate (biology).

Related terms: