1. act in an official capacity in a ceremony or religious ritual, such as a wedding

- Who officiated at your wedding?

Definition categories: social, perform

2. perform duties attached to a particular office or place or function

- His wife officiated as his private secretary

Similar word(s): function

Definition categories: competition, serve

Sentences with officiate as a verb:

- She officiated as registrar at the wedding.

- She officiated the wedding as registrar.

- This is the second time he has officiated at a cup-final.

- He's never officiated a cup-final before.