monotonic Syllabification: (mon·o·ton·ic)Pronunciation: /ˌmänəˈtänik/Definition of monotonic adjective 1 Mathematics (of a function or quantity) varying in such a way that it either never decreases or never increases. 2speaking or uttered with an unchanging pitch or tone:her dour, monotonic husbandDerivatives monotonicallyPronunciation: /-ik(ə)lē/ adverb monotonicityPronunciation: /ˌmänətnˈisətē/ noun monotonic in other Oxford dictionaries Definition of monotonic in the British & World English dictionary