to give pleasure to (a person or persons) by satisfying desires or humoring inclinations or feelings: Her praise will gratify all who worked so hard to earn it.
2.
to satisfy; indulge; humor, as one's desires or appetites.
3.
Obsolete. to reward; remunerate.
Origin: 1350–1400; Middle English gratifien < Latin grātificāre, equivalent to grāt(us) pleasing + -i--i- + -ficāre-fy
c.1540, "to show gratitude to," from L. gratificari "to do favor to, oblige, gratify," from gratus "pleasing" (see grace) + root of facere "make, do, perform" (see factitious). Meaning "to give pleasure to" is from 1568.