See also: Appendix:Variations of "os" English Noun 0s plural of 0 Noun 0s pl The period from year 1 AD to 9 AD; almost the same period as the 1st decade (of the 1st century), which, however, ended with year 10 AD (as 1 to 9 only were nine years)Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads