c. 1300, "courtesy, noble deeds," from kind (adj.) + -ness. Meanings "kind deeds; kind feelings; quality or habit of being kind" are from late 14c. Old English kyndnes meant "nation," also "produce, an increase."
kindergartener
kind-hearted
kindle
kindling
kindly
kindness
kindred
kine
kinema
kinematics
kinesics