dwi-tó-

“second, in two”

Debatednumbers

second

PIE ordinal for second, derived from *dwóh₁ "two".‍‌‍‌‌‍‍‌‌‌‌‍‌‌‍‌‍‍‌‍‍‍‍‌‍‌‍‌‌‍‍‌ Latin secundus from *sekw- "to follow" replaced this.

dwóh₁“two, a pair”h₁óynos“one, single, alone”kʷetwóres“four, the number four”oḱtṓw“eight, the number eight”pr̥h₃wós“first, foremost”swéḱs“six, the number six”tréyes“three, the number three”