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What do a.m. and p.m. stand for?

O.1

1.
(in prescriptions) a pint.
Origin of O.1
< Latin octārius

O.2

1.
2.
3.
4.
Ohio.
5.
Old.
6.
7.

o.1

1.
pint.
Origin
< Latin octārius

o.2

1.
2.
off.
3.
old.
4.
only.
5.
6.
Baseball. out; outs.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Related Abbreviations for O.

O.

  1. ocean
  2. Ohio
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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