From Longman Dictionary of Contemporary Englishdittodit‧to1 /ˈdɪtəʊ $ -toʊ/ ●○○ adverb spoken informal 🔊 🔊 1SAMEused to say that you have exactly the sameopinion as someone else 🔊 ‘I hated school.’ ‘Ditto.’2used to say that what is true of one thing is also true of another 🔊 Where should she go? Mississippi? Too hot. Ditto Alabama.
dittoditto2 (also ditto mark) noun (plural dittoes) [countable] written 🔊 🔊 SLAa mark (〃) that you write immediately under a word in a list to show that the same word is repeated
Examples from the Corpus
ditto• Or, possibly, Loopy Old Bats Against ditto.From Longman Business Dictionarydittodit‧to /ˈdɪtəʊ-toʊ/ noun [countable]a mark (") that you write beneath a word in a list so that you do not have to write the same word again