Domina

·noun Lady; a lady;

— a title formerly given to noble ladies who held a barony in their own right.

domina
dŏmĭna, ae (dat. and abl. plur. only dominis, Curt. 3, 12, 8; Inscr. Orell. 1629), f. [dominus]. I ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
domina
domina (domna, Ct.) ae, f dominus, a mistress, dame, lady, she who rules (esp. in the house): rem ...

An Elementary Latin Dictionary