"an occasion of drinking" (especially alcoholic beverages); "a liquor or potion drunk, concoction, medical drink," early 15c., potacioun, from Old French potacion, from Latin potationem (nom. potatio) "a drinking; poisonous drink, potion," noun of action from past participle stem of potare "to drink" (from PIE root *po(i)- "to drink").
*pō(i)-, Proto-Indo-European root meaning "to drink."
It forms all or part of: beer; bever; beverage; bib; bibitory; bibulous; hibachi; imbibe; imbrue; pinocytosis; pirogi; poison; potable; potation; potion; symposium.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit pati "drinks," panam "beverage;" Greek pinein "to drink," poton "that which one drinks," potos "drinking bout;" Latin potare "to drink," potio "a potion, a drinking," also "poisonous draught, magic potion;" Old Church Slavonic piti "to drink," pivo "beverage."