1. facultative - Adjective
2. facultative - Adjective Satellite
not compulsory
granting a privilege or permission or power to do or not do something
able to exist under more than one set of conditions
of or relating to the mental faculties
Source: WordNetelective surgery Source: Internet
an elective course of study Source: Internet
a facultative enactment Source: Internet
a facultative parasite can exist as a parasite or a saprophyte Source: Internet
A facultative anaerobe can tolerate anaerobic and aerobic conditions; however, an obligate anaerobe would die in the presence of even trace levels of oxygen. Source: Internet
Agkistrodon contortrix (copperhead snake) and Agkistrodon piscivorus (cotton mouth snake) can reproduce by facultative parthenogenesis. Source: Internet