Where does “declensionism” come from?

declensionism (English) comes from English declension, from Middle English declinson, from Middle French declinaison, from Latin dēclīnātiō, from Latin -ātiō, from Latin -tiō, from Latin dissertātiō, from Latin dissertus — small stone, pebble; gravel, rubble.

declensionism (English): A belief in a declining trend in a history

Definitions

A belief in a declining trend in a history

Ancestry of “declensionism”, step by step

Step	Language	Word	Meaning
1	English	declension	A falling off, decay or descent; The act of...
2	Middle English	declinson	—
3	Middle French	declinaison	—
4	Latin	dēclīnātiō	—
5	Latin	-ātiō	—
6	Latin	-tiō	—
7	Latin	dissertātiō	—
8	Latin	dissertus	arranged, disposed; explained
9	Latin	disserere	second-person singular future passive indicative...
10	Latin	dis-	asunder, apart, in two; reversal, removal;...
11	Latin	calceus	shoe
12	Latin	calx	limestone; chalk; the finish line
13	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

Every word from Ancient Greek χάλιξ →