Answer:
Yes, it is.
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Ditto is correct English when you are referring to a ditto mark (which looks like a quotation mark). That is, in a list if you have an item partly the same as the item above it, you can use a ditto mark in place of a repetation of the word.
Such as....
1. Take out trash.
2. Study algebra.
3. " French.
4. Save the world.
The ditto mark means "study" which is the word above it.