| 1. | a vocal utterance or series of speech sounds in one unvaried tone. |
| 2. | a single tone without harmony or variation in pitch. |
| 3. | recitation or singing of words in such a tone. |
| 4. | a person who is unable to discriminate between or to reproduce differences in musical pitch, esp. in singing. |
| 5. | sameness of tone or color, sometimes to a boring degree. |
| 6. | monotonous. |
| 7. | consisting of or characterized by a uniform tone of one color: a monotone drape. Compare monochromatic (defs. 1, 2). |
| 8. | Mathematics. monotonic (def. 2). |