Where does “nonpast” come from?

nonpast (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.

nonpast (English): Alternative form of non-past

Definitions

Alternative form of non-past

Ancestry of “nonpast”, step by step

nonpast 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 paﬆ

Step	Language	Word	Meaning
1	English	paﬆ	The period of time that has already happened, in contrast to the present and the future
2	English	passed	simple past tense and past participle of pass;...

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