Obligable

ob·li·gate  (bl-gt)

tr.v. ob·li·gat·ed, ob·li·gat·ing, ob·li·gates

1. To bind, compel, or constrain by a social, legal, or moral tie. See Synonyms at force.

2. To cause to be grateful or indebted; oblige.

3. To commit (money, for example) in order to fulfill an obligation.

adj. (-gt, -gt)

1. Biology Able to exist or survive only in a particular environment or by assuming a particular role: an obligate parasite; an obligate anaerobe.

2. Absolutely indispensable; essential.

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[Latin obligre, obligt-; see oblige.]

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obli·ga·ble (-g-bl) adj.

obli·gate·ly adv.

obli·gator n.