テンション

1894 is an early Japanese printed point for テンション: Seisenban Nihon Kokugo Daijiten cites a Natsume Soseki letter to Masaoka Shiki dated March 12. The English source is tension. English got the word through French and Latin tensio, related to tendere, to stretch, so its central meanings are stretching, strain, pressure, and mental stress; physics keeps the same pull-based sense. The borrowing first fits Meiji intellectual, psychological, mechanical, and later music vocabulary. Japanese dictionaries list mental strain, anxiety, physical tension, and machine adjustment. In Showa and Heisei popular speech, however, テンション shifted toward mood level, especially in phrases such as テンションが上がる, テンションが低い, and ハイテンション. Music also keeps テンションノート for jazz harmony, with related labels such as 9th, 11th, and 13th. Modern Japanese テンション is a common false friend for English speakers. テンションが高い usually means excited, lively, or in high spirits; English high tension points to stress, conflict, or electricity, as in high-tension wire. English dictionaries also use tension for pressure between opposing groups, as in political tension. A short example is 今日はテンション高いね, which comments on someone's energy rather than a strained relationship.