Etymology
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consultant (n.)

1690s, "person who consults an oracle," from consult + -ant. In medicine, "physician called in by the attending physician to give consultation in a case," by 1872 (perhaps from French, where it was in use by 1867); general meaning "one qualified to give professional advice" is first attested 1893 in a Sherlock Holmes story. Related: Consultancy (1955).

updated on March 19, 2018

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Definitions of consultant from WordNet

consultant (n.)
an expert who gives advice;
Synonyms: adviser / advisor
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.