I've never heard of such a meaning. Which dictionary did you find it in?
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Maria Dhere, number 9:http://translate.enacademic.com/?q =[niece{fk}]&f=ru&stype=1Unfortunately I do not see the exact same page as you; my number 9 is a French-language definition. I can see one definition for "mistress", though, taken from a dictionary of euphemisms. I guess I
Maria DCan I really use the word "niece" in the meaning of "lover, mistress"?Not even in Urban Dictionary does it have that meaning.