What does "heighten" mean?

Heighten: To carry forward; to advance; to increase; to augment; to aggravate; to intensify; to render more conspicuous; -- used of things, good or bad; as, to heighten beauty; to heighten a flavor or a tint. "To heighten our confusion." Addison. An aspect of mystery which was easily heightened to the miraculous. Hawthorne.