verb
commence
kuh-MENS/kəˈmens/
To begin or start.
The runner commences the race with a powerful push from the starting blocks.

Etymology
Old French comencier meant to begin or start. English first used the word for causing something to begin, then also for something itself coming into existence or entering a new state.
In context
until 11:00 when that trial was to commence my father and the rest of the family being obliged to attend as Witnesses
More examples
- Work commenced after the permit was approved.
- They will commence repairs next week.
- She commenced her presentation with a question.
Forms
commence · commences · commenced · commencing
commencement noun — a beginning