Abbreviation Encyclopedia
History
O.S. (History)
Full Form
Old Style
Details
Refers to dates recorded in the Julian calendar before a country adopted the Gregorian calendar.
Frequently Asked Questions
The full form of O.S. (History) is Old Style.
In the field of History, O.S. (History) stands for Old Style.
Refers to dates recorded in the Julian calendar before a country adopted the Gregorian calendar.