The Spanish verb 'terminar' (meaning 'to end' or 'to finish') comes from the Latin verb 'terminare', which meant 'to set bounds' or 'to limit'. This Latin verb was derived from 'terminus' meaning 'boundary' or 'limit', which in turn came from 'termen' meaning 'boundary marker'. The evolution of meaning from a physical boundary marker to the more abstract concept of ending or finishing something shows how language meanings can expand from concrete to more general uses over time.

Several common Spanish words share this root, including 'término' (term, end), 'terminal' (terminal), and 'determinado' (determined). All these words carry the core meaning of something having limits or boundaries, whether in time, space, or purpose.

English speakers might recognize this etymology in words like 'terminate', 'terminal', 'determine', and 'term'. All these words share the same Latin ancestor as 'terminar'. For example, a 'term' originally referred to a boundary or limit, which is why we use it to mean a defined period (as in 'school term') or a defined word ('technical term'). A 'terminal' is literally an end-point, maintaining that original sense of a boundary or limit.