inundation

Short definition from Wiktionary

Noun

1. 1
   The act of inundating; an overflow; a flood; a rising and spreading of water over grounds.
2. 2
   The state of being inundated; flooding.
3. 3
   An overflowing or superfluous abundance; a flood; a great influx.

Proper noun

1. 1
   One of the three seasons of Ancient Egypt.