obligate

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obligate

[′äb·lə·gət]
(biology)
Restricted to a specified condition of life, as an obligate parasite.
References in periodicals archive ?
Were this to be applied directly to the conduct of nations, as Wolff envisages, then it would result in Wolff's civitas maxima (or supreme world state) in which individual nations would be bound by obligative laws in the same way as individuals within a domestic state.
Equally, either the obligative or the potential mood can be used with a personal interpretation ("Juan must/can do X"), in which case they participate in the usual marking system, or they have a nonpersonal interpretation ("X must/can be done") in which case they are unmarked for conjunct/disjunct.