A single unvaried tone of speech or a sound. / A piece of writing in one strain throughout.

(transitive, intransitive) To speak in a monotone.

(of speech or a sound) Having a single unvaried pitch. / (mathematics) Being, or having the salient properties of, a monotone function.

plural of monotone

(mathematics) The property of being monotone.

simple past tense and past participle of monotone

(mathematics) monotonically

The property of being monotonous.

of or using the Greek system of diacritics which discards the breathings and employs a single accent to indicate stress. It replaced polytonic system in 1982.

In a manner that is tedious, repetitious or lacking in variety. / In a droning manner, that does not change pitch.