a list of persons or groups, as of military personnel or units with their turns or periods of duty.
any list, roll, or register: a roster of famous scientists; a roster of coming events.

1720–30; < Dutch rooster list, roster, literally, gridiron, in reference to the ruled paper used, equivalent to roost(en) to roast + -er -er1

1, 2. listing, slate, panel, record. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
roster1 (ˈrɒstə)
1.  a list or register, esp one showing the order of people enrolled for duty
2.  marketing the list of advertising agencies regularly used by a particular company
3.  (tr) to place on a roster
[C18: from Dutch rooster grating or list (the lined paper looking like a grid)]

roster2 (ˈrɒstə)
dialect (Northern English) a rascal

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1727, from Du. rooster "table, list," originally "gridiron," from M.Du. roosten "to roast" (see roast). So called from the grid of lines drawn on a paper to make a list.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Palfrey claims her client roster is loaded with the names of powerful
  government insiders.
But mostly, the roster is loaded with impact players who arrived in trades
  before they reached their potential.
He plans to double his roster of affiliated consultants by the end of the year.
As investors scaled back their risk exposure, the roster of falling currencies
  contained the usual suspects.
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