Where does “nontennis” come from?

nontennis (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.

nontennis (English): Not of or pertaining to the sport of tennis

Definitions

Not of or pertaining to the sport of tennis

Ancestry of “nontennis”, step by step

nontennis 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 tennis

Step	Language	Word	Meaning
1	English	tennis	A sport played by two players (or four in doubles), who alternately strike the ball over a net using racquets
2	Old French	tenez	second-person plural present indicative of tenir;...
3	Old French	tenir	to possess; to have; to hold
4	Latin	teneō	to hold, have; to grasp
5	Proto-Italic	tenēō	to hold
6	Proto-Indo-European	ten-	to stretch, to extend

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