1. o.s. - Noun
2. o.s. - Pronoun
o.s.
(in bibliographies) Initialism of old series.
o.s.
(chiefly grammar and lexicography) Initialism of oneself.
O.S. (countable and uncountable, plural O.S.'s)
Alternative form of OS
As of March 1 ( O.S. February 17 ), when the Julian calendar acknowledged a leap day and the Gregorian calendar did not, the Julian calendar fell one day further behind, bringing the difference to 13 days. Source: Internet
As of March 1 ( O.S. February 19 ), when the Julian calendar acknowledged a leap day and the Gregorian calendar did not, the Julian calendar fell one day further behind, bringing the difference to 11 days. Source: Internet
For infobox Elizabeth Petrovna ( Russian Елизавета (Елисавет) Петровна main) (29 December O.S. 18 December 1709 – 5 January 1762 O.S. 25 December 1761 ), also known as Yelisaveta and Elizaveta, was the Empress of Russia from 1741 until her death. Source: Internet
For check main Arthur St. Clair (March 23, 1736 O.S. – August 31, 1818) was an American soldier and politician. Source: Internet
But shortly before this Peter lost his throne (9 July O.S. 28 June 1762) and the conference did not occur. Source: Internet
He gave up Russian conquests in Prussia and offered 12,000 troops to make an alliance with Frederick II of Prussia (19 June O.S. 8 June 1762). Source: Internet