Generally not comparable.
Translations
The machine has a dual function.
Машина имеет двойную функцию.
He was known for his dual personality.
Он был известен своей двуличной личностью.
Definitions
Consisting of two parts, elements, or aspects. The car has a dual exhaust system for better performance.
Having a double nature or character. She has a dual role as both a mother and a teacher.
Relating to or involving two people or things. The dual ownership of the property made decision-making complicated.
Grammar: relating to or denoting the grammatical number that refers to exactly two items. In some Slavic languages, special dual forms are used for nouns referring to two objects.