Meaning of (उपपत्नी) upapatni in english
As noun : mistress Ex:  The cat laid the mouse before her mistress .
Other :
keep Ex:  He always flatters his superiors to keep himself in their good books. hetaera Ex:  Aspasia was probably a hetaera and ran a brothel concubine paramour hetaira
Suggested : a woman who cohabits with a man to whom she is not legally married, especially one regarded as socially or sexually subservient mistress to hold or retain in one's possession hold as one's own a woman who has authority, control , or power, especially the female head of a household, institution, or other establishment
Exampleउपपत्नी का हिन्दी मे अर्थ
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(उपपत्नी) upapatni
can be used as noun. and have more than one meaning. No of characters: 7 including vowels consonants matras.
Transliteration :
upapatnii