obligatory
adjective
oblig·a·to·ry
ə-ˈbli-gə-ˌtȯr-ē
ä-,
ˈä-bli-gə-
1
: binding in law or conscience
The ordinance made it obligatory that homeowners clear the snow from the sidewalks.
2
: relating to or enforcing an obligation
a writ obligatory
3
4
: obligate sense 1
an obligatory biped
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Merriam-Webster unabridged
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