D defs.my
Entry 2 senses Webster, 1913

Initiation

/ĭnˌ-ĭshˌ-ē-āsh'-ən/ · In·i·ti·a·tion · IPA /ɪˌnɪʃ.iˈeɪ.ʃən/
01 n. The act of initiating, or the process of being initiated or introduced; as, initiation into a society, into business, literature, etc.
  1. 1.
    The act of initiating, or the process of being initiated or introduced; as, initiation into a society, into business, literature, etc.
  2. 2.
    The form or ceremony by which a person is introduced into any society; mode of entrance into an organized body; especially, the rite of admission into a secret society or order.
    “Silence is the first thing that is taught us at our initiation into sacred mysteries.” — Broome.