Yours, Etc.: Origins and Uses of 8 Sign-Offs
late 14c., from Old French durabilité, from Late Latin durabilitatem (nominative durabilitas), noun of quality from Latin durabilis (see durable).
late 14c., from Old French durable (11c.), from Latin durabilis "lasting, permanent," from durare "to last, harden" (see endure). Durable goods attested from 1930.