ditto

1620s, Tuscan dialectal ditto "(in) the said (month or year)," literary Italian detto, past participle of dire "to say," from Latin dicere "speak, tell, say" (from PIE root *deik- "to show," also "pronounce solemnly").

Originally used in Italian to avoid repetition of month names in a series of dates; generalized meaning of "same as above" first recorded in English 1670s. Dittohead, self-description of followers of U.S. radio personality Rush Limbaugh, attested by 1995. dittoship is from 1869.

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