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Webster 1828 Edition

Adj.

Monotonous. [Little used.]

monotonic ‎(not comparable)

of or using the Greek system of diacritics which discards the breathings and employs a single accent to indicate stress.
(mathematics) said of a function that either never decreases or never increases as its independent variable increases.
Uttered in a monotone; monotonous.

of or using the Greek system of diacritics which discards the breathings and employs a single accent to indicate stress

mathematics: never decreasing or increasing as its independent variable increases