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Latin

From Proto-Italic *kʷettwōr (t duplicated), from Proto-Indo-European *kʷetwṓr, neuter plural of *kʷetwóres. Cognates include Sanskrit चतुर् (catur), Old Armenian չորք (čʿorkʿ), Ancient Greek τέσσαρες (téssares), and Old English fēower (English four).

The change of e to a is unexplained; the expected form would be *quettuor.