What is Omnilingualism?
Omnilingualism is the ability to decipher any language. This is not a common power, though one notable user of omnilingualism is Cypher of the New Mutants. Starfire also has a form of omnilingualism. She can instantly learn a being's language through physical contact with that being. The Pre-Crisis version of Superman knew nearly all Earthly and alien languages, effectively giving him this power.