The phrase "act whereby" is correct and usable in written English.
It is typically used in legal or formal contexts to refer to a specific action or process that is defined or established by a particular act or legislation.
Example: "The act whereby the new regulations were implemented has been met with mixed reactions from the public."
Alternatives: "measure through which" or "law that allows".
He foreknows that he will become incarnate in order to suffer death, a selfless act whereby humankind will be redeemed.
He beckons on his fiancee, who acts as his assistant for a stomach-churning act whereby he hangs a dustbin from his earlobes and swings it round.
Last month the president signed a bill reauthorizing the North American Wetlands Conservation Act, whereby the federal government matches donations from sportsmen, state wildlife agencies, conservationists and landowners who pledge to protect millions of acres of wetlands.
The government is unable to invoke the Parliament Act, whereby legislation can be passed without the consent of the House of Lords, because the bill started life in the upper chamber.
Can I claim the outstanding figure from my credit card company even though I didn't pay the balance by card - via section 75 of the Consumer Credit Act, whereby it states that transactions do not apply only to a deposit?
But the ACMD says it necessary to go further and adopt a system similar to the US analogue act whereby substances bearing a chemical similarity to existing controlled substances, such as amphetamines or the active ingredient in cannabis, are banned.
Location is the act or series of acts whereby the boundaries of the claim are marked, etc., but it confers no right in the absence of discovery, both being dessential to a valid claim.
At one end of the range are simple orienting acts whereby we use our sensory receptors to sample task-relevant information – such as looking at a relevant stimulus or listening for a relevant sound.
He spoke of his worries about the "unknown unknowns" in the wake of the Patriot Act - whereby no one can ever tell anyone they have private information on you.
If the parties are unable to agree terms through negotiation then the leaseholder would normally exercise rights they may have under the Leasehold Reform Act 1967 whereby the purchase price is set by a tribunal".
The reservation land was later dispersed by means of the Dawes General Allotment Act (1887), whereby parcels of land were distributed to individuals (and could be bought by non-Indians).
