Definition of union
(adj)
being 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"
of
trade 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 resources
turned the scale"
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"