Meaning

adjective large and roomy (`convenient' is archaic in this sense)

originFrom Middle English commodious (“convenient, advantageous”), from Anglo-Norman commodious, Old French commodieux, directly from Medieval Latin commodiosus (“convenient, useful”), irregularly from Latin commodus (“suitable, fit, convenient”), from com- + modus (“measure, manner”), ultimately from Proto-Indo-European *med- (“to measure”). Analyzable as commode (“to provide with an appropriate or…

Etymology from Wiktionary, CC BY-SA 3.0