formal By means of this:
— I hereby declare you man and wife.

synonym: herewith.

Roget 631: through, by, per; whereby, thereby, hereby; by the agency of etc. 170; by dint of; by virtue of, in virtue of; through the medium of etc. n.; along with; on the shoulders of; by means of etc. 632; by the aid of, with the aid of etc. (assistance) 707.    per fas et nefas [Lat.], by fair means or foul; somehow, somehow or other; by hook or by crook.    ... show more