Where does “abnegation” come from?

Abnegation comes from Middle English abnegacioun, from Late Latin abnegatio, from Latin abnego meaning to deny or reject, formed from ab and negare.

abnegation (English): A denial; a renunciation; denial of desire or...

Definitions

abnegation traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Latin	abnegātiō	The act of denying; denial
2	Latin	-tiō	tion, -ation, -ing
3	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
4	Latin	dissertus	arranged, disposed; explained
5	Latin	disserere	second-person singular future passive indicative...
6	Latin	dis-	asunder, apart, in two; reversal, removal;...
7	Latin	calceus	shoe
8	Latin	calx	limestone; chalk; the finish line
9	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

Step	Language	Word	Meaning
1	Middle English	abnegacioun	—
2	Late Latin	abnegatio	The act of denying; denial
3	Latin	abnego	I refuse, deny, decline, am unwilling
4	Latin	ab-	from, away, away from; off; at a distance
5	Latin	āb	from, away from, out of
6	Proto-Germanic	*ab	—
7	Proto-Indo-European	apó	—