Dictionary > Obligate

Obligate

Definition
adjective
(general) Compulsory; restricted to a set of parameters or conditions; having no alternative system or pathway.
(biology) Capable of functioning or surviving only in a particular condition or by assuming a particular behavior.
Supplement
This descriptive term, which means ‘by necessity’ is used mostly in biology, such as the following:

Word origin: L obligātus (ptp. of obligāre to bind).
Compare: facultative.