Definition of union
of or having to do with the northern
United States and those loyal
to the Union during the American Civil War; "Union soldiers"; "Federal forces"; "a Federal infantryman"
unions; "the union
movement"; "union negotiations"; "a union-shop clause
in the contract"
the United States (especially the northern
states during the American Civil War); "he has visited every state
in the Union"; "Lee hoped to detach
Maryland from the Union"; "the North's superior
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"