"shorthand, stenography," 1640s, from Latinized form of Greek takhygraphia, from takhys "swift" (see tachy-) + -graphia (see -graphy). Related: Tachygraphic; tachygrapher "stenographer" (especially among the ancients; see Tironian).[tachygraphy etymology, tachygraphy origin, 英语词源]