Something or someone well established is well known, totally trusted and usually has a proven track record of success.

Becoming established doesn't happen overnight. You've got to put in the time and effort to prove yourself, make connections and build a good reputation. So it makes sense that this adjective is related to the verb establish, which means to "create, set up, or prove." Established is a handy word to know, especially when you're looking for a dentist — you probably won't want to try Dr. Lovedrill until his practice is more established.

Definitions of established
  1. adjective
    brought about or set up or accepted; especially long established
    “the established social order”
    “a team established as a member of a major league”
    “enjoyed his prestige as an established writer”
    “an established precedent”
    “the established Church”
    synonyms: constituted
    deep-rooted, deep-seated, implanted, ingrained, planted
    (used especially of ideas or principles) deeply rooted; firmly fixed or held
    established firmly and securely
    grooved, well-grooved
    established as if settled into a groove or rut
    in accordance with recognized or accepted standards or principles
    (of a church) given official status as a national or state institution
    recognised, recognized
    provided with a secure reputation
    self-constituted, self-established
    constituted by or established by itself
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    not established
    unrecognised, unrecognized
    not having a secure reputation
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  2. adjective
    conforming with accepted standards
    synonyms: conventional
    mainstream, orthodox
    adhering to what is commonly accepted
  3. adjective
    settled securely and unconditionally
    synonyms: accomplished, effected
    established or decided beyond dispute or doubt
  4. adjective
    shown to be valid beyond a reasonable doubt
    “the established facts in the case”
    proved, proven
    established beyond doubt
  5. adjective
    introduced from another region and persisting without cultivation
    synonyms: naturalized
    foreign, strange
    relating to or originating in or characteristic of another place or part of the world
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