hereby
adv. manner C1 Advanced US //hɪɹˈbaɪ// UK //hˈiəbaɪ// here·by
adv. a formal way to say 'by this action' or 'with this document'. You use it in official papers to make a statement official right now.
adv. by means of this act, document, or statement. Used to effect a formal change in status or to grant authority within the text itself.
I hereby declare the meeting open.
By signing this contract, you hereby agree to all the terms and conditions listed above.
The committee members hereby authorize the treasurer to release the necessary funds for the restoration project, effective immediately upon the signing of this resolution.
From here + by.
Usage
Typically used in legal, religious, or highly formal contexts; usually placed immediately after the subject or at the start of a declaration.