2. The state of being concrete or inspissated; consistence; spissitude; as the thickness of paint or mortar; the thickness of honey; the thickness of the blood.
3. The extent of a body from side to side, or from surface to surface; as the thickness of a tree; the thickness of a board; the thickness of the hand; the thickness of a layer of earth.
4. Closeness of the parts; the state of being crowded or near; as the thickness of trees in a forest; the thickness of a wood.
5. The state of being close, dense or impervious; as the thickness of shades.
6. Dullness of the sense of hearing; want of quickness or acuteness; as thickness of hearing.