Etymology
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tachygraphy (n.)

"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).

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Definitions of tachygraphy

tachygraphy (n.)
a method of writing rapidly using an abbreviated symbolic system;
Synonyms: shorthand / stenography
From wordnet.princeton.edu