key to

verb

keyed to; keying to; keys to

chiefly US

1

: to make (something) suitable for (a particular use or type of person)

I try to key my lectures to my audience.

—often used as (be) keyed to

The educational program is keyed to the needs of working women.

2

: to change (something) in a way that is closely related to (something else)

—usually used as (be) keyed to

The amount of money they receive is keyed to the rate of inflation.