What does "mode" mean?

Additional senses

1. 2.Variety; gradation; degree. Pope.
2. 3.(Metaph.) Any combination of qualities or relations, considered apart from the substance to which they belong, and treated as entities; more generally, condition, or state of being; manner or form of arrangement or manifestation; form, as opposed to matter. Modes I call such complex ideas, which, however compounded, contain not in them the supposition of subsisting by themselves, but are considered as dependencies on, or affections of, substances. Locke.
3. 4.(Logic) The form in which the proposition connects the predicate and subject, whether by simple, contingent, or necessary assertion; the form of the syllogism, as determined by the quantity and quality of the constituent proposition; mood.
4. 5.(Gram.) Same as Mood.
5. 6.(Mus.) The scale as affected by the various positions in it of the minor intervals; as, the Dorian mode, the Ionic mode, etc., of ancient Greek music. Note: In modern music, only the major and the minor mode, of whatever key, are recognized.
6. 7.A kind of silk. See Alamode, n. See Method.