commencement

noun
UK /kəˈmensmənt/
US /kəˈmensmənt/

The time when something starts.

The commencement of the school year is in September.


OTHER MEANINGS

2. A ceremony where students receive their degrees or diplomas.

My sister wore a cap and gown to her college commencement.

3. The formal act of beginning something official.

The commencement of the new bridge project was celebrated by the town.

4. The first part of a formal speech or event.

At the commencement of the meeting, the chairperson welcomed everyone.