Etymology
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saturate (v.)

1530s, "to satisfy, satiate, fill full" (senses now obsolete), from Latin saturatus, past participle of saturare "to fill full, sate, drench," from satur "sated, full" (from PIE root *sa- "to satisfy").

In chemistry, the meaning "to impregnate or unite with until no more can be received" is from 1680s; the general sense of "soak thoroughly, imbue (with)" is by 1756. The commercial sense of "oversupply" (a market, with a product) is by 1958. As a noun, "a saturated fat," by 1959. Related: Saturated; saturating.

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Definitions of saturate

saturate (v.)
cause (a chemical compound, vapour, solution, magnetic material) to unite with the greatest possible amount of another substance;
saturate (v.)
infuse or fill completely;
Synonyms: impregnate
From wordnet.princeton.edu