startday
nounUK /ˈstɑːt.deɪ/
US /ˈstɑːrt.deɪ/
The day when something begins.
The startday of our school fair is Monday.
OTHER MEANINGS
2. The first day of a project or event.
We marked the startday of the building work on the calendar.
3. A day set aside to begin a new activity.
Her startday for piano lessons is next week.
4. The day a race or game kicks off.
The startday of the tournament was sunny and warm.