Английский Этимологический словарь - saturate (v.)

- 1538, probably from adj. (early 15c.), from L. saturatus, pp. of saturare "to fill full, sate, drench," from satur "sated, full," from PIE base *sa- "to satisfy." Originally "satisfy;" meaning "soak thoroughly" first recorded 1756. Saturation bombing first recorded 1942.