WordNet sense 1 (a social or business relationship):

affiliation, association, tie-up

WordNet sense 2 (the finish of a contest in which the score is tied and the winner is undecided):

draw, standoff

WordNet sense 3 (one of the cross braces that support the rails on a railway track):

sleeper, crosstie, railroad tie

WordNet sense 4 (a horizontal beam used to prevent two other structural members from spreading apart or separating):

tie beam

WordNet sense 5 (neckwear consisting of a long narrow piece of material worn (mostly by men) under a collar and tied in knot at the front):

necktie

WordNet sense 6 (a fastener that serves to join or connect):

link, linkup, tie-in

WordNet sense 7 (create social or emotional ties):

bind, bond, attach

WordNet sense 8 (perform a marriage ceremony):

marry, splice, wed

WordNet sense 9 (connect, fasten, or put together two or more pieces):

connect