Webster's Revised Unabridged Dictionary · 1913

Initiatory

Initiatory , adjective

1.
Suitable for an introduction or beginning; introductory; prefatory; as, an initiatory step. — Bp. Hall
2.
Tending or serving to initiate; introducing by instruction, or by the use and application of symbols or ceremonies; elementary; rudimentary.
Some initiatory treatises in the law. — Herbert
Two initiatory rites of the same general import can not exist together. — J. M. Mason

Initiatory , noun

An introductory act or rite. [Rare]