verb

bring together or into contact so that a real or notional link is established.

the electrodes were connected to a recording device

attach,join,fasten,fix,affix,couple,link,bridge,secure,make fast,tie,tie up,bind,fetter,strap,rope,tether,truss,lash,hitch,moor,anchor,yoke,chain,stick,tape,adhere,glue,bond,cement,fuse,weld,solder,pin,peg,screw,bolt,rivet,batten,pinion,clamp,clip,hook (up),add,append,annex,subjoin,concatenate