Where does “nondouble” come from?

nondouble (English) comes from English non, from French non, from Old French non, from Latin nōn, from Old Latin noenum, from Proto-Indo-European óynos — one; single.

nondouble (English): Not double

Definitions

Not double

Ancestry of “nondouble”, step by step

nondouble traces back through two separate lines of ancestry.

via English non

Step	Language	Word	Meaning
1	English	non	Obsolete form of none
2	French	non	no; not; a no, a negative response
3	Old French	non	no; not; Alternative form of nom
4	Latin	nōn	not
5	Old Latin	noenum	—
6	Proto-Indo-European	óynos	one; single

via English doublé

Step	Language	Word	Meaning
1	English	doublé	A compound attack that deceives the opponent's...
2	French	doublé	double, brace, pair; double; doublé
3	Middle French	double	—
4	Old French	doble	double
5	Latin	dūplus	double (twice as much, or as big)
6	Proto-Italic	*duplos	double

Every word from Proto-Indo-European óynos →