WordNet sense 1 (a person who is in a position to give you special assistance):

middleman

WordNet sense 2 (the physical coming together of two or more things):

striking, impinging

WordNet sense 3 (a communicative interaction):

touch

WordNet sense 4 (a channel for communication between groups):

liaison, link, inter-group communication

WordNet sense 5 (a thin curved glass or plastic lens designed to fit over the cornea in order to correct vision or to deliver medication):

contact lens

WordNet sense 6 ((electronics) a junction where things (as two electrical conductors) touch or are in physical contact):

tangency

WordNet sense 7 (be in direct physical contact with; make contact):

adjoin, meet

WordNet sense 8 (be in or establish communication with):

reach, get through, get hold of

WordNet sense 9 (the act of touching physically):

physical contact