o.s

Dictionary.com Unabridged

O.S.

2
1.
Old Saxon.
2.
Old School.
3.
Old series.
4.
(of the calendar) Old Style.
5.
Also, o.s. ordinary seaman.

ordinary seaman

noun
a seaman insufficiently skilled to be classified as an able-bodied seaman. Abbreviation: O.D., O.S., o.s.

Origin:
1695–1705

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
ordinary seaman
 
n
a seaman of the lowest rank, being insufficiently experienced to be an able-bodied seaman

o.s., OS or O/S
 
abbreviation for
1.  out of stock
2.  banking outstanding
 
OS, OS or O/S
 
abbreviation for
 
O/S, OS or O/S
 
abbreviation for

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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American Heritage
Abbreviations & Acronyms
o.s.
  1. Latin oculus sinister (left eye)

  2. old series

  3. out of stock

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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