Where does “decades-long” come from?

decades-long (English) comes from English decades, from English decade, from Middle English decade, from Middle French decade, from Latin decās, from Ancient Greek δεκάς, from Ancient Greek -ᾰ́ς, from Proto-Indo-European -ónts — sound, voice.

decades-long (English): Lasting multiple decades (i.e. greater than twenty years)

Definitions

Lasting multiple decades (i.e. greater than twenty years)

Ancestry of “decades-long”, step by step

decades-long traces back through two separate lines of ancestry.

via English decades

Step	Language	Word	Meaning
1	English	decades	plural of decade
2	English	decade	A group, set, or series of ten, particularly
3	Middle English	decade	—
4	Middle French	decade	a series of 10 books
5	Latin	decās	a decade (period of ten years)
6	Ancient Greek	δεκάς	the number ten; a group of ten, decade
7	Ancient Greek	-ᾰ́ς	group of
8	Proto-Indo-European	-ónts	Derives nouns denoting body parts
9	Hungarian	önt	to pour; to cast; accusative singular of ön
10	Hungarian	ön	you
11	Hungarian	ön-	self-
12	Turkish	ön	front
13	Ottoman Turkish	اوك	voice (of human or animal); sound
14	Proto-Turkic	ǖn	sound, voice

via English long

Step	Language	Word	Meaning
1	English	long	Having much distance from one terminating point...
2	English	longitude	Angular distance measured west or east of the...
3	Old French	longitude	—
4	Latin	longitūdō	length, longitude; longness
5	Latin	longus	far, long; extended, prolonged; long; tedious,...
6	Latin	-ē	ly; used to form adverbs from adjectives
7	Latin	dis-	asunder, apart, in two; reversal, removal;...
8	Latin	calceus	shoe
9	Latin	calx	limestone; chalk; the finish line
10	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

Every word from Proto-Turkic ǖn →