The word "terminal" originates from the Latin root terminus, which translates directly to boundary, limit, or end marker. Historically, ancient Romans used stone markers called termini to mark the final boundaries of properties and fields. Over centuries, the English language adopted the root to describe anything that marks an extremity or conclusion. This is why the end of a railway line or bus route became known as a terminus or terminal station, why electrical endpoints where circuits finish their path are called terminals, and why incurable end-stage illnesses are classified as terminal. The etymology always ties back to the concept of reaching the final limit or boundary of a system.
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