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Inamorata
Romantic Nature
Use 'inamorata' to emphasize the romantic aspect of the relationship more than a term like 'partner' would. 
Literary Flair
'Inamorata' has a poetic sound, making it suitable for creative writing or when you want to add a touch of elegance. 
Gender Specific
'Inamorata' is used exclusively for a female lover; the male equivalent is 'inamorato'. 