obligatory

Adjective

• morally or legally constraining or binding
  • "attendance is obligatory"
  • "an obligatory contribution"

Adjective Satellite

• required by obligation or compulsion or convention
  • "he made all the obligatory apologies"

Adj

• Imposing obligation, legally, morally, or otherwise; binding; mandatory.
• Requiring a matter or obligation.

Examples

• an obligatory promise

Synonyms

bounden, mandatory

Antonyms

optional

Related Words

obligate, obligated, obligation, obligational, obligato, obligatorily, oblige, obligee, obliger, obliging, obligingly, obligingness, obligor