adj

mandatory

MAN-duh-tree

adj

Required by law, rule, or authority; compulsory.

"Seatbelts are mandatory for all passengers."

"Attendance at the meeting is mandatory for every employee."

How to Use Mandatory

Learner’s notes

In plain EnglishSomething you must do; not optional.

Easily confused with

optional → voluntary →

Common pairings

mandatory training mandatory sentence mandatory retirement

more mandatory comparative, mandatories plural, most mandatory superlative

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Seatbelts are _____ for all passengers.

From Late Latin mandatorius, related to mandator ("one who commands") — ultimately from the same root as mandate.

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