initiate

1 initiate /ɪˈnɪʃiˌeɪt/ verb
initiates; initiated; initiating
1 initiate
/ɪˈnɪʃiˌeɪt/
verb
initiates; initiated; initiating
Britannica Dictionary definition of INITIATE
[+ object]
1 
formal : to cause the beginning of (something) : to start or begin (something)
2 
: to formally accept (someone) as a member of a group or organization usually in a special ceremony
3 
: to teach (someone) the basic facts or ideas about something — usually + into

— initiator

/ɪˈnɪʃiˌeɪtɚ/ noun, plural initiators [count]
2 initiate /ɪˈnɪʃijət/ noun
plural initiates
2 initiate
/ɪˈnɪʃijət/
noun
plural initiates
Britannica Dictionary definition of INITIATE
[count]
: a person who is being formally accepted or who has been formally accepted as a member of a group or organization