1800s

Noun

 * 1) The period from 1800 to 1899, almost the same period as the nineteenth century (which, however, was from year 1801 to 1900)
 * 2) 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)