1.VerbTo be superior in strength, dominance, influence, or frequency; to have or gain the advantage over others; to have the upper hand; to outnumber others.
"Red colour prevails in the Canadian flag.; Sunny skies will prevail across the Northeast."
2.VerbTo triumph; to be victorious.
3.VerbTo be current, widespread, or predominant; to have currency or prevalence.
"In his day and age, such practices prevailed all over Europe."