Obligatory

//əˈblɪɡətɔɹi// adj

Definitions

Adjective
  1. 1
    Imposing obligation, legally, morally, or otherwise; binding; mandatory.

    "an obligatory promise"

  2. 2
    Requiring a matter or obligation.
Adjective
  1. 1
    morally or legally constraining or binding wordnet
  2. 2
    required by obligation or compulsion or convention wordnet

Etymology

From Middle English obligatorie, from Latin obligatōrius.

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