1800s noun[plural only]2 •The period from 1800 to 1899, almost the same period as the nineteenth century (which, however, was from year 1801 to 1900).The converted code will be able to handle dates that span centuries (1800s, 1900s, and 2000s at least). — 1996 •The period from 1800 to 1809, almost the same period as the 1st decade of the 19th century (which, however was the years 1801 to 1810).
