Hereby

• POS: Adverb
• HYPHEN: here=by

CIDE DICTIONARY

Hereby, adv. 

•  By means of this.  [1913 Webster]

  "And hereby we do know that we know him."  [1913 Webster]
•  Close by; very near.  Shak.  [1913 Webster]

OXFORD DICTIONARY

Hereby, adv. by this means; as a result of this.

THESAURUS

Hereby

by, by dint of, by means of, by use of, by virtue of, by way of, herewith, in virtue of, on, per, thanks to, thereby, therewith, through, upon, whereby, wherewith, wherewithal, with

ROGET THESAURUS

Hereby

Instrumentality

N instrumentality, aid, subservience, subserviency, mediation, intervention, medium, intermedium, vehicle, hand, agency, minister, handmaid, midwife, accoucheur, accoucheuse, obstetrician, gobetween, cat's-paw, stepping-stone, opener, key, master key, passkey, latchkey, open sesame, passport, passe-partout, safe-conduct, password, instrument, expedient, means, instrumental, useful, ministerial, subservient, mediatorial, intermediate, intervening, conducive, through, by, per, whereby, thereby, hereby, by the agency of, by dint of, by virtue of, in virtue of, through the medium of, along with, on the shoulders of, by means of, by the aid of, with the aid of, per fas et nefas, by fair means or foul, somehow, somehow or other, by hook or by crook.