Etymology
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obligatory (adj.)

"binding in law or conscience, imposing duty, requiring performance of or forbearance from some act," c. 1400, obligatorie, from Old French obligatoire "creating an obligation, obligatory," and directly from Late Latin obligatorius "binding," from obligat-, past-participle stem of obligare "to bind, bind up, bandage," figuratively "put under obligation" (see oblige).

updated on July 25, 2019

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Definitions of obligatory from WordNet

obligatory (adj.)
morally or legally constraining or binding;
an obligatory contribution
attendance is obligatory
obligatory (adj.)
required by obligation or compulsion or convention;
he made all the obligatory apologies
From wordnet.princeton.edu, not affiliated with etymonline.