mandatory

Etymology

From Late Latin mandatorius (“of or belonging to a mandator”), from mandātor (“one who commands”); see mandate.

adj

1. Obligatory; required or commanded by authority.
   Attendance at a school is usually mandatory for children.
   This kind of immediate control structure we take to be characteristic of the tribe, and it leads to a rather rigid type of system in which 'every action not mandatory is forbidden'. 1999, Ian Stewart, Jack Cohen, Figments of Reality: The Evolution of the Curious Mind, page 276
   It also discusses the access to legal instruments for enforcement with regard to mandatory disclosure of environmental information. 2011, Dirk Bünger, Deficits in EU and US Mandatory Environmental Information Disclosure: Legal, Comparative Legal and Economic Facets of Pollutant Release Inventories, Springer Science & Business Media, page 57
   While in the most serious cases mounting an investigation is usually mandatory, there are other occasions where it is less clear-cut or when it is concluded that an investigation would not fulfil RAIB's objectives to improve safety or prevent future accidents. December 29 2021, Paul Stephen, “Rail's accident investigators”, in RAIL, number 947, pages 30–31
2. Of, being or relating to a mandate.
   Mandatory Palestine

noun

1. (disc golf) A sign or line that require the path of the disc to be above, below or to one side of it.
2. (dated, rare) A person, organisation or state who receives a mandate; a mandatary.