adjective
obligatory
uh-BLIHG-uh-tree
adjective
1
Required by rule, law, or custom; compulsory.
"Wearing a hard hat is obligatory on the construction site."
How to Use Obligatory
Learner’s notesIn plain EnglishCompulsory — something you must do, not optional.
Easily confused with
Word Forms
more obligatory comparative, most obligatory superlative
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Wearing a hard hat is _____ on the construction site.
Etymology
From Latin obligatorius, from the same root as obligation.