Meaning of the Sanskrit Word: itihasam

  itihāsam—history    SB 4.25.9, SB 6.3.35, SB 6.14.9, SB 6.17.40, SB 6.17.41, SB 7.2.27
  itihāsam—the history (of Ajāmila)    SB 6.1.20
  itihāsam—historical narration    SB 6.2.47-48
  itihāsam—historical incident    SB 7.13.11

Can't find any compound Sanskrit words containing itihasam.