All 5 Uses

initiate
in
Perfect Chemistry
(Edited)

Well, that was until he called and said all the pledges in the fraternity had to sleep at the frat house for some crazy initiation thing.
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initiation = ceremony to accept someone's membership into an organization
We've grown up together …. played on this playground since we were kids and even got initiated into the Latino Blood at the same time.

initiated = accepted someone's membership though a special procedure such as a ceremony and/or period of instruction and/or test
Wil got initiated recently and now he thinks he's the shit.
Before I know it he'll be jumped in and get the ritual beating as the initiation into the Latino Blood just like I got.

initiation = the process of accepting someone's membership though a special procedure such as a ceremony and/or period of instruction and/or test
I have a lot of respect for Hector because he's the guy who initiated me into the Latino Blood.

initiated = accepted someone's membership though a special procedure such as a ceremony and/or period of instruction and/or test

Definitions:

(1) (initiate as in: initiate discussions)
to cause (something) to begin
(2) (initiate as in: initiate into the art of drumming)
introduce to an activity or area of knowledge
(3) (initiate as in: initiate into the fraternity)
to accept someone's membership into an organization -- typically in a ceremony -- sometimes including a period of instruction and/or test
(4) (initiate as in: She is a new initiate.)
someone who has formally started in an organization, or been introduced to or attained some expertise in a particular field
(5) (meaning too rare to warrant focus)