Where does “nonfailure” come from?

nonfailure (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.

nonfailure (English): Absence of failure; That which is not a failure

Definitions

Absence of failure; That which is not a failure

Ancestry of “nonfailure”, step by step

nonfailure 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 failure

Step	Language	Word	Meaning
1	English	failure	State or condition of not meeting a desirable or...
2	Anglo-Norman	failer	—
3	Old French	faillir	alternative infinitive of falir; to fail, err
4	Latin	fallēre	—

Every word from Proto-Indo-European óynos →Every word from Old Latin noenum →Every word from Latin nōn →