Where does “ostentacioun” come from?

ostentacioun (Middle English) comes from Middle French ostentation, from Latin ostentatio, from Latin ostentō, from Latin ostendō, from Latin obs-, from Latin ob-, from Latin obolus, from Ancient Greek ὀβολός — to throw, reach, pierce; to hit by throwing.

Ancestry of “ostentacioun”, step by step

Step	Language	Word	Meaning
1	Middle French	ostentation	—
2	Latin	ostentatio	exhibition, display, showing off
3	Latin	ostentō	to exhibit, show, present
4	Latin	ostendō	to expose to view, exhibit, show
5	Latin	obs-	in front of
6	Latin	ob-	towards; against
7	Latin	obolus	obolus (Greek coin)
8	Ancient Greek	ὀβολός	obol, obolus, used at Athens as both a weight and...
9	Ancient Greek	ὀβελός	a spit, rod; a horizontal line
10	Ancient Greek	βέλος	missile, arrow, dart; weapon; something quickly...
11	Proto-Indo-European	gʷélHos	—
12	Proto-Indo-European	gʷelH-	to throw, reach, pierce; to hit by throwing

Words derived from “ostentacioun”

Every word from Proto-Indo-European gʷelH- →Every word from Latin ob- →Every word from Proto-Indo-European gʷélHos →