hereby

UK: /ˌhɪə^rˈbaɪ/ US: /hɪrˈbaɪ, ˈhɪrˌbaɪ/ ,(hēr bī′, hēr′bī′)

WordReference Random House Learner's Dictionary of American English © 2025

here•by /hɪrˈbaɪ, ˈhɪrˌbaɪ/   adv. 

1. by this action, document, etc.:
   I hereby resign (= By saying or writing this, I resign).

WordReference Random House Unabridged Dictionary of American English © 2025

here•by  (hēr bī′, hēr′bī′), adv. 

1. by this, or the present, declaration, action, document, etc.;
   by means of this;
   as a result of this:
   I hereby resign as president of the class.
2. [Obs.] nearby.

• Middle English. See here, by 1200–50

Collins Concise English Dictionary © HarperCollins Publishers::

hereby / ˌhɪəˈbaɪ/ adverb

1. (used in official statements, proclamations, etc) by means of or as a result of this