Where does “oración” come from?

oración (Galician) comes from Old Portuguese oraçon, from Latin ōrātiō, from Latin -tiō, from Latin dissertātiō, from Latin dissertus, from Latin disserere, from Latin dis-, from Latin calceus — small stone, pebble; gravel, rubble.

oración (Galician): prayer, the act of praying; a prayer, an instance...

Definitions

prayer, the act of praying; a prayer, an instance...

Ancestry of “oración”, step by step

Step	Language	Word	Meaning
1	Old Portuguese	oraçon	—
2	Latin	ōrātiō	speech, discourse, language
3	Latin	-tiō	tion, -ation, -ing
4	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
5	Latin	dissertus	arranged, disposed; explained
6	Latin	disserere	second-person singular future passive indicative...
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 Ancient Greek χάλιξ →Every word from Latin -tiō →Every word from Latin dis- →