Arousal refers to a state of being awake, alert, and excited about something. It can describe feeling more energized, attentive, or sexually stimulated. It is the opposite of feeling tired, bored, or uninterested. Full definition
The effects of sensation seeking and misattribution of arousal of attraction toward similar or dissimilar strangers (cambridge.org)
Sometimes called the «female Viagra,» flibanserin works by affecting brain receptors to increase sexual arousal in women. (scientificamerican.com)
Regarding parents» direct responses to their child's emotions, research has shown that mothers who respond in a sensitive manner to negative child emotions like anxiety, for example by comforting the child, directly foster an optimal level of arousal in their children as evidenced by a decrease in heart rate and smooth return to positive affect (Conradt and Ablow 2010; Haley and Stansbury 2003). (link.springer.com)