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Noun
Definition: A category ๐ with a bifunctor โ:๐โจฏ๐โ๐ which may be called tensor product, an associativity isomorphism ๐ผ_(A,B,C):(AโB)โCโAโ(BโC), an object I which may be called tensor unit, a left unit natural isomorphism ๐_A:IโAโA, a right unit natural isomorphism ๐_A:AโIโA, and some "coherence conditions" (pentagon and triangle commutative diagrams for those isomorphisms).