Definition of prevails:
(v) :
(intransitive) To be superior in strength, dominance, influence, or frequency; to have or gain the advantage over others; to have the upper hand; to outnumber others.
(v) :
(intransitive) To triumph; to be victorious.
(v) :
(intransitive) To be current, widespread, or predominant; to have currency or prevalence.
(v) :
(intransitive) To succeed in persuading or inducing.
(v) :
(transitive, obsolete) To avail.