adjective
preparatory
prih-PAIR-uh-tor-ee/prɪˈpærətɔːri/
Serving to prepare someone or something for a later activity or stage.
The musician performs preparatory warm-up exercises.

Etymology
The pieces describe serving to make ready beforehand. A preparatory action prepares the way for something that follows, making readiness its purpose.
In context
the blackout in Britain, preparatory to German air bombing raids, which so far had not occurred
More examples
- She took a preparatory course before the examination.
- Several preparatory meetings settled the schedule.
- The exercise was preparatory to the main task.
Forms
preparatory
prepare verb — make ready
Similar words
- preliminary
- Preliminary means coming before; preparatory specifically helps make someone or something ready.
- introductory
- Introductory begins or presents a subject; preparatory equips someone for a later stage.