Kinktionary
More like guidelines and a lot less like definitions.
Domina
Domina is a title used for a dominatrix or domme derived from Latin. It is used in many languages globally and it can mean: lady of the house, mistress, dominant female, lady of honor, the head of a nunnery, or a noble lady who held a barony. The Male version of Domina is Dominus.
The word has roots in the word 'dominae' which was not bdsm related, but was more for addressing a lady love, a wife or a mistress. It is believed to have evolved into domina during the Medieval Latin era.