How do you spell Prevailing

Available Definitions:
1)  a. - Having superior force or influence; efficacious; persuasive.
2)  a. - Predominant; prevalent; most general; as, the prevailing disease of a climate; a prevailing opinion.
3)  v. i. - To persuade or induce; -- with on, upon, or with; as, I prevailedon him to wait.