Adjective
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| obligatory -
morally or legally constraining or binding; "attendance is obligatory"; "an obligatory contribution"
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optional possible but not necessary; left to personal choice
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necessary unavoidably determined by prior circumstances; "the necessary consequences of one's actions"
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bounden morally obligatory; "my bounden duty"
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compulsory,
mandatory,
required required by rule; "in most schools physical education is compulsory"; "attendance is mandatory"; "required reading"
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de rigueur required by etiquette or usage or fashion; "instruction as to when and where a silk hat is de rigueur"
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imposed set forth authoritatively as obligatory; "the imposed taxation"; "rules imposed by society"
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incumbent on morally binding or necessary; "it is incumbent on me to attend"
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indispensable unavoidable; "the routine but indispensable ceremonies of state"
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| obligatory -
required by obligation or compulsion or convention; "he made all the obligatory apologies"
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