Established
Established adjective - Brought about or set up or accepted; especially long established.
Required and established are semantically related. In some cases you can use "Required" instead an adjective "Established".
Nearby Words: establishment, establishing
Required
Required adjective - Forcing one's compliance or participation by or as if by law.
Established and required are semantically related. Sometimes you can use "Established" instead an adjective "Required".
Nearby Words: requirement, requiring
Mutual synonyms
Both words in one sentence
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Tokugawa Iemitsu, Ieyasu's grandson, established the policy of sankin kōtai ("alternate attendance"), which required every daimyō to reside in Edo every other year.
Source: Useful Notes / Tokyo -
Of course, a needlessly elaborate double-blind keyword system was established to restore the memories when required.
Source: Memory Gambit - Kraftwerk started out as this, with various musicians joining as required, before settling into a fairly established lineup.
Source: Revolving Door Band
Cite this Source
Required and Established. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/established/required
Established & Required. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/established/required>.
Required or Established. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/established/required.
Google Ngram Viewer shows how "established" and "required" have occurred on timeline