Roots/*h₁newn̥h₁newn̥“nine, the number nine”Widely acceptednumbernine, ninthRoot for the number nine, yielding Latin novem, English nine, Greek ennea.Related Rootsdel-“to count, recount, tell”dwo-“two, a pair”déḱm̥“ten, a decade”h₃eḱtō“eight, the number eight”penkʷe“five, the number five”sem-“one, together”sem-₂“one, same, together”septm̥“seven, the number seven”