Of, at, relating to, or forming a limit, boundary, extremity, or end. Botany Growing or appearing at the end of a stem, branch, stalk, or similar part. Of, at, relating to, or being the end of a section or series; final. See Synonyms at last1. Relating to or occurring in a term or each term: terminal inventories. Causing, ending in, or approaching death; fatal: terminal cancer; a terminal patient. A point or part that forms the end. An ornamental figure or object placed at the end of a larger structure; a finial. Electricity A position in a circuit or device at which a connection is normally established or broken. Electricity A passive conductor at such a position used to facilitate the connection. Either end of a railroad or other transportation line; a terminus. A station at the end of a transportation line or at a major junction on a transportation line. A town at the end of a transportation line. Computer Science A device, often equipped with a keyboard and a video display, through which data or information can be entered or displayed.