How to say “that is / i.e.” in Greek

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δηλαδή thee-la-THEE

that is / i.e.

“Είναι αργά, δηλαδή δεν θα έρθει.”

It's late, that is, he won't come.

This word doesn't change form the way verbs, nouns, and adjectives do — what you see above is its only form.