1. Sea: This is the most common meaning of "mare" in Spanish. It refers to the sea, especially in phrases like:
* "La mar está en calma": The sea is calm.
* "Navegar por la mar": To sail the sea.
2. Mare (female horse): While less common than the first meaning, "mare" can also refer to a female horse.
3. (Informal) Trouble: In some regions of Spain, "mare" can be used informally to mean "trouble" or "difficulty". This is not a standard meaning, though.
It's important to consider the context to understand which meaning of "mare" is intended. If you're unsure, it's always a good idea to ask for clarification.