1. noun
a) A list of names, usually for an organization of some kind such as military officers and enlisted personnel enrolled in a particular unit; a muster roll; or a sports team, with the names of players who are eligible to be placed in the lineup for a particular game.
The secretary has produced a new cleaning roster for the Church over the remainder of the year.
b) A list of the jobs to be done by members of an organization and often with the date/time that they are expected to do them.
2. verb
The act of placing a name on a roster.
I have rostered you for cleaning duties on the first Monday of each month.
Wikipedia foundation.