A continuous, unchanging sound or tone, especially of someone's voice. The teacher's monotone made it difficult for the students to stay awake during the lecture.
A single, unvaried color or shade. The artist's use of monotone in the painting created a somber mood.
A function or sequence that is entirely non-increasing or non-decreasing; a monotonic function. Because g(x) is a monotone on [0,1], it attains its extrema only at the endpoints.