c. 1400, "to bestow grace upon;" 1530s, "to show gratitude to," from Latin gratificari "to do favor to, oblige, gratify," from gratus "pleasing" (from suffixed form of PIE root *gwere- (2) "to favor") + combining form of facere "to make, do, perform" (from PIE root *dhe- "to set, put"). Meaning "to give pleasure to" is from 1560s. Related: Gratified; gratifying.
