inamorate
/ɪnəmɔˈrɑːtə/ i-nə-mō-RÄ-tə
Definitions
1. noun
a woman with whom one is in love, especially a woman who is not formally the object of one’s affections, but with whom one has a romantic or amorous interest
“He was smitten with his inamorata, a beautiful young artist.”