* The (feminine singular) - This is the most common meaning of "la" in Spanish. It's the feminine equivalent of "el" (the masculine singular). For example: "la casa" (the house), "la mujer" (the woman), "la luna" (the moon).
* It (feminine singular) - When referring to a feminine noun, "la" can also be used as a pronoun meaning "it". For example: "La veo" (I see it), "La quiero" (I love it).
* Her (possessive pronoun) - "La" can also mean "her" in certain contexts. For example: "La camisa de ella" (her shirt), "La comida de ella" (her food).
If you provide more context about where you saw "la" used, I may be able to give you a more specific translation.