1. the action of beginning something or causing something to begin
2. the action of admitting someone into a secret or obscure society or group, typically with a ritual
3. the action of introducing someone to a new activity or skill

Examples

• The initiation of the new policy caused widespread debate.
• Her initiation into the honor society was a proud moment.
• The fraternity’s initiation ceremony lasted all night.
• The initiation of peace talks brought hope to the region.
• New employees undergo an initiation process during their first week.
• The initiation into advanced mathematics can be challenging for students.
• The club’s initiation ritual has remained unchanged for decades.