The term "terminus" has a few different meanings depending on the context in which it is used. Here are some possible definitions:
A final destination or end point, especially for a transportation route or journey. For example, "The train's terminus was the station in the city center."
The end or final point of something, such as a physical object or a period of time. For example, "The trail's terminus was at the top of the mountain."
A boundary or limit, such as the end of a street or the edge of a property. For example, "The fence marks the terminus of our land."