Real Dictionary

ditto
In informal English, you can use ditto to represent a word or phrase that you have just used in order to avoid repeating it. In written lists, ditto can be represented by ditto marks – the symbol " – underneath the word that you want to repeat.

ditto in American English
as said above; as before; likewise
the same (as something said or appearing above or before)
to duplicate or make copies of
adverb: as already stated; likewise
noun: the aforesaid; the above; the same (used in accounts, lists, etc., to avoid repetition)
transitive verb: to make a copy of, using a Ditto machine