Concupiscence (from Late Latin noun concupiscentia, from the Latin verb concupiscere, from con-, "with", here an intensifier, + cupi(d)-, "desiring" + -escere, a verb-forming suffix denoting beginning of a process or state) is an ardent, usually sensual, longing. Involuntary sexual arousal is explored in the Confessions of Augustine, wherein he used the term "concupiscence" to refer to sinful lust. In Catholic theology, concupiscence is seen as a desire of the lower appetite contrary to reason.
There are nine occurrences of concupiscence in the Douay-Rheims Bible and three occurrences in the King James Bible. It is also one of the English translations of the Koine Greek epithumia (ἐπιθυμία), which occurs 38 times in the New Testament.