Equa is the Latin equivalent of 'mare'. The masculine gender noun 'admissarius' means 'stallion'. The general purpose word for 'horse' is the masculine gender noun 'equus'.
On the off chance that the question really means "What is the meaning of the Latin word 'mare'?": it means "sea". For example, the first moon landing occurred on a plain known as the Mare Tranquillitatis, "Sea of Tranquility". (Not that the Moon actually has vast bodies of water, but the astronomers who first named the features of the lunar surface didn't know that.)
Aequore; altum; mare.
Mare.
Mare.
Mare is Latin for "sea."
mare
mare
Mare
In ponto; in mare.
Oceanus; mare.
Mare nostrum.
The Latin word mare is equivalent to the English word "sea".
mare, maris n.