Where does “undeclaration” come from?

undeclaration (English) comes from English declaration, from Middle English declaration, from Old French declaration, from Latin declaratio, from Latin -tiō, from Latin dissertātiō, from Latin dissertus, from Latin disserere — small stone, pebble; gravel, rubble.

undeclaration (English): The act of undeclaring something previously...

Definitions

The act of undeclaring something previously...

Ancestry of “undeclaration”, step by step

undeclaration traces back through two separate lines of ancestry.

via English declaration

Step	Language	Word	Meaning
1	English	declaration	A written or oral indication of a fact, opinion,...
2	Middle English	declaration	—
3	Old French	declaration	—
4	Latin	declaratio	The act of making clear; a disclosure,...
5	Latin	-tiō	tion, -ation, -ing
6	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
7	Latin	dissertus	arranged, disposed; explained
8	Latin	disserere	second-person singular future passive indicative...
9	Latin	dis-	asunder, apart, in two; reversal, removal;...
10	Latin	calceus	shoe
11	Latin	calx	limestone; chalk; the finish line
12	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

via English un

Step	Language	Word	Meaning
1	English	un	One

Every word from Ancient Greek χάλιξ →Every word from Latin -tiō →Every word from Latin dis- →