A duty roster (also commonly called a rota) is a way to divide time into various tasks. These can then be allocated to individuals. It often takes the form of a calendar-like table, which is split into days of the week and individual times on the two axis.

What is the meaning of a duty roster?

: a roster of a military unit showing what duties (as guard and kitchen police) each person has performed.

What does it mean when you see a roster?

: a list of the people or things that belong to a particular group, team, etc. : a group of people or things whose names are included on a roster. : a list that shows the order in which a job or duty is to be done by the members of a group.