A very basic toilet facility: This is the most common meaning of the word. A latrine is typically a hole in the ground that is used for human waste disposal. It may or may not have a structure built around it, and it is often used in areas where there is no access to a proper sewer system.
A historical term for a bathroom: In the past, latrines were more common than they are today. They were used in homes, businesses, and public places. Today, the word "latrine" is rarely used to refer to a bathroom, but it is sometimes used in historical contexts.