The word 'term' entered English in the 13th century from the Old French terme, which itself derived from the Latin terminus, meaning a boundary stone, limit, or end. This Latin noun is likely rooted in the Proto-Indo-European base ter-, which conveyed the sense of to cross over, pass through, or overcome, thus conceptually marking a point of transition or a limit. The evolution of meaning from a physical boundary to an abstract limit—such as a period of time, a condition of an agreement, or a defining word—illustrates a classic semantic shift from the concrete to the conceptual, where the idea of a delimiting point remains central.

The word 'terms' is the plural form of the simplex noun 'term'. It is not productively segmented into smaller meaningful units in modern English. The root 'term-' originates from Latin terminus (boundary, limit, end).