Etymology
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gratis (adv.)

mid-15c., "for nothing, freely," from Latin gratis, contraction of gratiis "for thanks," hence, "without recompense, for nothing," ablative of gratiae "thanks," plural of gratia "favor" (from suffixed form of PIE root *gwere- (2) "to favor"). Meaning "free of charge" is 1540s.

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Definitions of gratis
1
gratis (adv.)
without payment;
I'll give you this gratis
Synonyms: for free / free of charge
2
gratis (adj.)
costing nothing;
Synonyms: complimentary / costless / free / gratuitous
From wordnet.princeton.edu