In a spacious, comfortable, or convenient way; with ample room and suitable arrangements.
From commodious (spacious, from Latin commodus meaning suitable) plus -ly adverbial suffix. Evolved in English during the 16th century from architectural and comfort vocabulary.
When Victorians described their homes as 'commodiously arranged,' they were bragging about having plenty of space—a real luxury when most people were cramped! It's the adverb version of showing off your comfort.
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