Obligatory a. : Binding in law or conscience; imposing duty or obligation; requiring performance or forbearance of some act; -- often followed by on or upon; as, obedience is obligatory on a soldier.

Example:
Why DGCA can't make it Obligatory on airlines to train fresh Aircraft Mantence Engineers, instead of oversea

Taxonomy
uh, blig, Dictionary, tor, obligation, Synonyms, adjective, ry, bl, tawr, tohr, guh, Pronunciation, binding, Obligatory Definition, obligate, oblique, recording.

Defination from the web:
Obligatory - Definition of Obligatory at Dictionary.com a free online dictionary with pronunciation, synonyms, and translation of Obligatory. ... Search another word or see obligatory on Thesaurus | Reference. Facebook Twitter Follow us: ...