mainly American to arrange or plan something so that it is suitable for a particular person or situationusually passive
Each player is paid a salary keyed to his position and ability.
key to (something)
To make sure that something matches or is consistent with something else. A noun or pronoun can be used between "key" and "to." If you don't key your expectations to your students' actual abilities, you'll just end up disappointed.
key to
v.
To make something correspond to something else: I wrote up a teaching guide and keyed it to the materials for each lesson. The worksheets were keyed to the requirements for each course.