noun A list of individuals or groups, usually for an organization of some kind such as military officers and enlisted personnel enrolled in a particular unit; a muster roll; a sports team, with the names of players who are eligible to be placed in the lineup for a particular game; or a list of students officially enrolled in a school or class.
I'm number 12 on the roster for tonight's game.
noun A list of the jobs to be performed by members of an organization and often with the date and time that they are expected to perform them.
The secretary has produced a new cleaning roster for the Church over the remainder of the year.
noun A schedule or timetable setting out shift times and dates for each employee of a business.
noun A bracketed list that shows the elements of a set.
verb To place the name of (a person) on a roster.
I have rostered you for cleaning duties on the first Monday of each month.
verb To show the elements of a set by listing them inside brackets.