From Longman Dictionary of Contemporary Englishgentlewomangen‧tle‧wo‧man /ˈdʒentlˌwʊmən/ noun (plural gentlewomen /-ˌwɪmɪn/) [countable] old use SSCLASS IN SOCIETYa woman who belongs to a high social class
Examples from the Corpus
gentlewoman• She is a gentlewoman born, as you know, let her always be treated as such.• But he found himself unable to say it, especially not to this so very obvious gentlewoman. 