Key and Mandatory

Key

Key adjective - Coming before all others in importance.

Mandatory and key are semantically related. In some cases you can use "Mandatory" instead an adjective "Key".

Nearby Words: keyed, keyboard, keying

Mandatory

Mandatory adjective - Forcing one's compliance or participation by or as if by law.

Key and mandatory are semantically related. Sometimes you can use "Key" instead an adjective "Mandatory".

Nearby Words: mandate, mandated, mandatary, mandating

Both words in one sentence

  • Immediately following Ellery's mandatory Eureka Moment, he would turn to the audience, briefly review the key evidence for the viewers, and ask them if they'd figured out who the culprit was.
    Source: The Summation
  • Loads and Loads of Loading: Here and here/ Lock and Key Puzzle: A mandatory part of dungeon design.
  • No Fourth Wall Immediately following Ellery's mandatory Eureka Moment, he would turn to the audience, briefly review the key evidence for the viewers, and ask them if they'd figured out who the culprit was — right before going to a commercial.
Cite this Source
Mandatory and Key. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/key/mandatory
Key & Mandatory. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/key/mandatory>.
Mandatory or Key. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/key/mandatory.
Google Ngram Viewer shows how "key" and "mandatory" have occurred on timeline