This is the 11033rd most frequent Spanish word.
dominar
To have control or mastery over something or someone.
In this sentence, 'domina' is used to mean that the subject has mastery or fluency in multiple languages.
Ella domina varios idiomas y puede comunicarse con personas de diferentes países.
She masters several languages and can communicate with people from different countries.
Here, 'dominar' is used in the context of fully understanding and controlling a set of rules for a game.
Para ganar en este juego, necesitas dominar las reglas perfectamente.
To win at this game, you need to master the rules perfectly.
In this case, 'dominar' relates to acquiring proficiency and skill in specific techniques required for an activity.