In Tcl/Tk dicsussions, binding most often refers the act of associating, with the bind command (or the bind subcommand of a canvas), a Tk event with a bindtag and a script (most often a single command). Such bindings can also be made to fileevents, and, in specialized extensions, to reception of data from data managers, COM events, ...
There is also a more generic meaning in the theory of computer languages:
Tcl has several different ways to bind names which are canvassed in scope.
Shouldn't binding (verb) rather be the act of creating a binding (noun), than the act of resolving it?