1. link, couple, fasten, attach; conjoin, combine; associate, consolidate, amalgamate. Join, connect, unite all imply bringing two or more things together more or less closely. Join may refer to a connection or association of any degree of closeness, but often implies direct contact: One joins the corners of a mortise together. Connect implies a joining as by a tie, link, or wire: One connects two batteries. Unite implies a close joining of two or more things, so as to form one: One unites layers of veneer sheets to form plywood. 10. abut, border.