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What is another word for arousal?

What's another word for arousal? | Here's a list of synonyms for arousal.

Definition 1: the act of arousing - [noun denoting act]

Definition 1: mutual sexual fondling prior to sexual intercourse - [noun denoting act]

Definition 1: awakening from sleep - [noun denoting cognition]

Definition 1: a state of heightened physiological activity - [noun denoting state]