Etymology
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hereby (adv.)

mid-13c., "near here, nearby," from here + by (prep.). Meaning "by means of this" is from early 14c. Compare Dutch hierbij, German hierbei.

updated on July 04, 2015

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Definitions of hereby from WordNet

hereby (adv.)
(formal) by means of this;
I hereby declare you man and wife
Synonyms: herewith
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.