Effect in achieving a goal or aim; purpose, use (now usually in negative constructions).

“I tried fixing it, to no avail.  Labor, without economy, is of little avail.”

Proceeds; profits from business transactions.

An advertising slot or package.

To turn to the advantage of.

“I availed myself of the opportunity.”

To be of service to.

“Artifices will not avail the sinner in the day of judgment.”

To promote; to assist.