Where does “veintiuno” come from?

veintiuno (Spanish) comes from Spanish uno, from Old Spanish uno, from Latin ūnus, from Old Latin oinos, from Proto-Italic oinos, from Proto-Indo-European óynos — one; single.

veintiuno (Spanish): twenty-one

Definitions

twenty-one

Ancestry of “veintiuno”, step by step

veintiuno traces back through 3 separate lines of ancestry.

via Spanish uno

Step	Language	Word	Meaning
1	Spanish	uno	one
2	Old Spanish	uno	one
3	Latin	ūnus	one, single
4	Old Latin	oinos	one
5	Proto-Italic	oinos	cardinal number 1 Previous: n/a Next: *duō;...
6	Proto-Indo-European	óynos	one; single

via Spanish veinte

Step	Language	Word	Meaning
1	Spanish	veinte	twenty
2	Old Spanish	veynte	twenty
3	Latin	vīgintī	twenty
4	Latin	quīnque	five; 5
5	Proto-Italic	kʷenkʷe	five
6	Proto-Indo-European	pénkʷe	five

via Spanish y

Step	Language	Word	Meaning
1	Spanish	y	and; plus, and; well
2	Old Spanish	e	and
3	Latin	et	and; plus; though, even if
4	Proto-Indo-European	éti	beyond; over
5	Proto-Indo-European	h₁é	and, then
6	Proto-Indo-European	ǵʰe	Postpositional intensifying particle: indeed, at any rate, in fact

Words derived from “veintiuno”

Every word from Proto-Indo-European óynos →Every word from Proto-Italic oinos →Every word from Old Latin oinos →