1. Suitable for an introduction or beginning; introductory; prefatory
2. Tending or serving to initiate; introducing by instruction, or by the use and application of symbols or ceremonies; elementary; rudimentary.
ETYM Pref. pre + Latin liminaris belonging to a threshold, from limen, liminis, threshold, entrance: cf. French préliminaire. Related to Limit.
Designed to orient or acquaint with the a situation before proceeding.