Ditto is defined as something you say to show you are in agreement or to signify that something you already said can be said again.
(noun)To ditto is defined as to make copies of something or to repeat an action.
(verb)An example of ditto is to make copies of a receipt using a Xerox machine.
See ditto in Webster's New World College Dictionary
noun pl. dittos
Origin: It (Tuscan), var. of detto, said < L dictus, pp. of dicere, to say: see diction
adverb
See ditto in American Heritage Dictionary 4
noun pl. dit·tos
Origin:
Origin: Italian dialectal
Origin: , past participle of Italian dire, to say
Origin: , from Latin dīcere; see deik- in Indo-European roots
. Word History: Ditto, which at first glance seems a handy and insignificant sort of word, actually has a Roman past, for it comes from dictus, “having been said,” the past participle of the verb dīcere, “to say.” In Italian dīcere became dire and dictus became detto, or in the Tuscan dialect ditto. Italian detto or ditto meant what said does in English, as in the locution “the said story.” Thus the word could be used in certain constructions to mean “the same as what has been said”; for example, having given the date December 22, one could use 26 detto or ditto for 26 December. The first recorded use of ditto in English occurs in such a construction in 1625. The sense “copy” is an English development, first recorded in 1818. Ditto has even become a trademark for a duplicating machine.Learn more about ditto