The word "terminal" gets its name from the Latin root word terminus, which translates directly to boundary, limit, or end marker. In ancient Rome, termini were stone markers used to define the ultimate boundaries of fields and properties. Over centuries, the English language adopted this root to describe anything that marks an extremity, boundary, or final destination. This historical etymology explains why the end of a railway line or bus route became known as a terminal station, why electrical endpoints where circuits finish their path are called terminals, and why incurable end-stage illnesses are classified as terminal. The naming convention always links back to the concept of reaching the final limit or boundary of a system.
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