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"Aun" is a form of "aun", an adverb which is often translated as "even". "Incluso si" is a phrase which is often translated as "even if". Learn more about the difference between "incluso si" and "aun" below.
incluso si()
aun()
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).