Roots/*h₁óynosh₁óynos“one, single, alone”Widely acceptednumbersonePIE word for one. Gives Latin ūnus, English "one", "an", "alone", Greek oínē "ace on die".Related Rootsdwi-tó-“second, in two”dwóh₁“two, a pair”déḱm̥t“ten, a decade”kʷetwóres“four, the number four”oḱtṓw“eight, the number eight”pr̥h₃wós“first, foremost”swéḱs“six, the number six”tréyes“three, the number three”