1900s /naɪn.tiːnˈhʌn.dɹədz/ noun2 •A period that began on January 1, 1900 and ended on December 31, 1999; almost the same period as the 20th century (which, however, was from year 1901 to 2000) •A period that began on January 1, 1900 and ended on December 31, 1909; almost the same period as the 1st decade of the 20th century, which, however, was from year 1901 to (the end of) 1910.There are never-published treasures like British entrepreneur William Turner's scenes of Shanghai life in the early 1900s — probably taken with a homemade pinhole camera. — 2010