obligate: Meaning and Definition of

ob•li•gate

1. to bind or oblige morally or legally: to obligate oneself to purchase a building.
2. to pledge, commit, or bind (funds, property, etc.) to meet an obligation.

1. morally or legally bound; obliged; constrained.
2. necessary; essential.
3. restricted to a particular condition of life, as certain organisms that can survive only in the absence of oxygen:(opposed to facultative). obligate anaerobe