To lend something to someone for their temporary use, with the understanding that they will return the same type of thing later.
From Latin commodare (to make convenient, lend), derived from commodus (suitable, convenient). The word evolved through Medieval Latin into English legal terminology.
This word is the legal ancestor of 'accommodation'—but commodate specifically means lending with an expectation of return, like borrowing a cup of sugar and returning a cup of sugar later. It's still used in law today!
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