mandatory
- adjective (adj)
Meaning: required, necessary
Synonyms:
binding
commanding
compelling
compulsatory
compulsory
de rigueur
essential
forced
imperative
imperious
indispensable
involuntary
irremissible
needful
obligatory
requisite
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.