2851059 jmdict A [id=2226752]
２０００年代
にせんねんだい
[1][n]
  the 2000s (decade, i.e. 2000-2009); the '00s; the aughts; the noughties
[2][n]
  the 2000s (century, i.e. 2000-2099)
[3][n]
  the 2000s (millennium, i.e. 2000-2999)