Herewithinadverb
(archaic) Within this.
Herewithadverb
with this; especially, with this letter or communication
Herewithadverb
by this means
Herewithadverb
in this way, hereby
Herewithadverb
With this.
Herewithadverb
(formal) by means of this;
‘I hereby declare you man and wife’;