adjective/ʁa.sjɔ.nɛl/
rational; reasonable; rational (of a number, capable of being expressed as the ratio of two integers)
“C'est aussi que, se préoccupant des métiers qui devaient mettre en œuvre leurs conceptions décoratives, ils composaient leurs motifs en vue d'une exécution facile et rationnelle.” — It is also the case that, being mindful of the crafts responsible for realizing their decorative designs, they composed their motifs with a view to easy and rational execution.
Antonyms: irrationnel
Learned borrowing from Latin ratiōnālis.