sixtieth
American Heritage Dictionary:
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six·ti·eth
(sĭk'stē-ĭth) 
n.
n.
- The ordinal number matching the number 60 in a series.
- One of 60 equal parts.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Mentioned in
Broken Promises: The United Nations at 60
(2005 Culture & Society Film)
Cantata for the 60th birthday of Rimsky-Korsakov, for chorus & piano
(Classical Work)
Marilyn Horne: Reminiscence
(1994 Music Film)
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