,| 1. | one of a series of rows or ranks rising one behind or above another, as of seats in an amphitheater, boxes in a theater, guns in a man-of-war, or oars in an ancient galley. |
| 2. | one of a number of galleries, as in a theater. |
| 3. | a layer; level; stratum: The wedding cake had six tiers. All three tiers of the firm's management now report to one director. |
| 4. | Australian. a mountain range. |
| 5. | to arrange in tiers. |
| 6. | to rise in tiers. |

tier