pre·par·a·to·ry 
(prĭ-părə-tôr′ē, -pâr-, prĕpər-ə-)
(prĭ-părə-tôr′ē, -pâr-, prĕpər-ə-)adj.
1. Serving to make ready or prepare; introductory. See Synonyms at preliminary.
2. Relating to or engaged in study or training that serves as preparation for advanced education: a preparatory course; preparatory students.
adv.
In preparation for. Used with to: thoroughly cleaned the house preparatory to our departure.
pre·par′a·tori·ly adv.