Where does “rational” come from?

rational (Old French) comes from Latin rationalis, from Latin ratiō, from Latin -tiō, from Latin dissertātiō, from Latin dissertus, from Latin disserere, from Latin dis-, from Latin calceus — small stone, pebble; gravel, rubble.

Ancestry of “rational”, step by step

Step	Language	Word	Meaning
1	Latin	rationalis	accounts; rational, reasonable, of or possessing...
2	Latin	ratiō	—
3	Latin	-tiō	—
4	Latin	dissertātiō	—
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

Words derived from “rational”

Every word from Ancient Greek χάλιξ →