1. (n.) Any part of a curved line.

2. (n.) Usually a curved member made up of separate wedge-shaped solids, with the joints between them disposed in the direction of the radii of the curve; used to support the wall or other weight above an opening. In this sense arches are segmental, round (i. e., semicircular), or pointed.

3. (n.) A flat arch is a member constructed of stones cut into wedges or other shapes so as to support each other without rising in a curve.

4. (n.) Any place covered by an arch; an archway; as, to pass into the arch of a bridge.

5. (n.) Any curvature in the form of an arch; as, the arch of the aorta.

6. (v. t.) To cover with an arch or arches.

7. (v. t.) To form or bend into the shape of an arch.

8. (v. i.) To form into an arch; to curve.

9. (a.) Chief; eminent; greatest; principal.

10. (a.) Cunning or sly; sportively mischievous; roguish; as, an arch look, word, lad.

11. (n.) A chief.

12. (n.) A suffix meaning a ruler, as in monarch (a sole ruler).

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