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gra·tis (gratis, grät-, grāt-)

adverb, adjective

without charge or payment; free

Origin: L < gratia, a favor: see grace

grat·is (grătˈĭs, gräˈtĭs, grāˈ-)

adverb & adj.
Without charge.

Origin: Middle English, from Latin grātīs, alteration of grātiīs, out of kindness, free, ablative pl. of grātia, kindness; see gwerə-2 in Indo-European roots.