firstduty
nounUK /ˌfɜːstˈdjuːti/
US /ˌfɜːrstˈduːti/
The first job or task you must do.
Washing your hands is your firstduty before you eat.
RELATED WORDS
OTHER MEANINGS
2. The first turn someone has to work at a job.
Her firstduty at the hospital was on a Monday morning.
3. The very first thing a machine or tool is made to do.
The robot's firstduty is to sort the boxes.
4. A duty that comes before all other duties.
A doctor's firstduty is to keep patients safe.