obligatory

 
Pronunciation: /əˈblɪgət(ə)ri/

adjective

  • required by a legal, moral, or other rule; compulsory: use of seat belts in cars is now obligatory
  • (of a ruling) having binding force: a sovereign whose laws are obligatory
  • often humorous so customary or fashionable as to be expected of everyone or on every occasion: it was a quiet little street with the obligatory pub at the end

Derivatives

obligatorily

adverb

Origin:

late Middle English: from late Latin obligatorius, from Latin obligat- 'obliged', from the verb obligare (see oblige)

Spelling help

The ending of obligatory is -ory.