Where does “proadvertising” come from?

proadvertising (English) comes from English pro, from English professional, from English profession, from Anglo-Norman professioun, from Old French profession, from Latin professiō, from Latin -tiō, from Latin dissertātiō — small stone, pebble; gravel, rubble.

proadvertising (English): In support of advertising

Definitions

In support of advertising

Ancestry of “proadvertising”, step by step

proadvertising traces back through two separate lines of ancestry.

via English pro

Step	Language	Word	Meaning
1	English	pro	An advantage of something, especially when...
2	English	professional	A person who belongs to a profession; A person...
3	English	profession	A declaration of belief, faith or one's opinion,...
4	Anglo-Norman	professioun	—
5	Old French	profession	profession; declaration
6	Latin	professiō	declaration, avowal, profession (act of professing)
7	Latin	-tiō	tion, -ation, -ing
8	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
9	Latin	dissertus	arranged, disposed; explained
10	Latin	disserere	second-person singular future passive indicative...
11	Latin	dis-	asunder, apart, in two; reversal, removal;...
12	Latin	calceus	shoe
13	Latin	calx	limestone; chalk; the finish line
14	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

via English advertising

Step	Language	Word	Meaning
1	English	advertising	Communication whose purpose is to influence...
2	English	advertise	To give (especially public) notice of (something); to announce publicly
3	Middle English	advertisen	To pay attention
4	Middle French	advertir	to warn
5	Old French	avertir	to inform; to notify; to notice; to remark
6	Latin	advertō	to turn to or towards
7	Latin	ad-	to; usually prefixed to verbs, in which cases it...
8	Latin	īn-	un-, non-, not
9	Latin	în	in, at, on, upon, from (space)
10	Latin	en	lookǃ beholdǃ; reallyǃ?; come onǃ
11	Proto-Italic	en	in
12	Proto-Indo-European	h₁én	in

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