Definition of prevailency in English:

prevailency

noun

rare
  • Formerly: †power, influence; = "prevalence" (obsolete). In later use: the quality of being widespread or common, pervasiveness.

Origin

Mid 17th century; earliest use found in Edward Williams (fl. 1650), author. From prevail + -ency, after prevailent.

Pronunciation

prevailency

/prɪˈveɪl(ə)nsi/