O. S.
See also:
Appendix:Variations of "os"
English
Noun
O.
S.
(
uncountable
)
Alternative form of
OS
(
calendar systems
)
Abbreviation of
old style
.
Anagrams
S&O
,
SO
,
So
,
So.
,
s.o.
,
s/o
,
so
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