What's the difference between commodious and discommodious?

Commodious

Definition:

(a.) Adapted to its use or purpose, or to wants and necessities; serviceable; spacious and convenient; roomy and comfortable; as, a commodious house.

Example Sentences:

(1) Certain biologic principles prompt consideration of segmental mastectomy and axillary node sampling as an alternative, commodious form of treatment for such lesions.
(2) Sites commodious enough and with sufficient conserved carboxylate ligands to accommodate such a nucleus occur inside the protein coat at the subunit dimer interfaces.
(3) Everyone enmeshed will fervently hope so – especially Rupert Murdoch, who's bankrolled his publishing arm by lumping in his own commodious Australian TV profits to keep the newsprint show on the road.