. "a set containing all and only the members of two or more given sets; \"let C be the union of the sets A and B\""@en-us . "0"^^ . . . "join"@en-us . . . . . . . "07998712-n"^^ . . "sum"@en-us . "a set containing all and only the members of two or more given sets; \"let C be the union of the sets A and B\""@en-us . . "0"^^ . . . "107998712"^^ . "union"@en-us . . . . . . . . . "107514819"@en-us . "union"^^ . . . "105991434"@en-us .