O/S

O/S

(of the calendar) Old Style.
Dictionary.com Unabridged

o/s

1.
(of the calendar) Old Style.
2.
out of stock.
3.
(in banking) outstanding.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
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
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