Longman Dictionary of Contemporary English homepage

obligatory

adjective
     
ob‧lig‧a‧to‧ry
1 formal something that is obligatory must be done because of a law, rule etc [= compulsory, mandatory]
it is obligatory for somebody (to do something)
It is obligatory for companies to provide details of their industrial processes.
2 [only before noun] used humorously to describe something that is always done or included in a particular situation:
She offered him the obligatory cup of tea.

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