roster Pronunciation: ⁄ ˈrɒstə ⁄ noun · a list or plan showing turns of duty or leave for individuals or groups in an organization: next week’s duty roster · a list of members of a team or organization, in particular of sports players available for team selection: a cluster of outstanding players on the club’s rosterthe label assembled an extraordinarily eclectic roster of artists verb [with object] chiefly British · place on or assign according to a duty roster: the locomotive is rostered for service on Sunday