Etymology
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monotone (n.)

"unvarying tone in music or speaking, utterance at one unvaried pitch," 1640s; see monotony. OED says use of the word as a noun is peculiar to English.

Monotone is a natural device for increasing the sonority of the voice, so that it may readily fill a large space, and is also thought by some to have a peculiar solemnity of effect. It is much used as an element in chanting. [Century Dictionary]

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Definitions of monotone
1
monotone (n.)
an unchanging intonation;
Synonyms: drone / droning
monotone (n.)
a single tone repeated with different words or different rhythms (especially in rendering liturgical texts);
2
monotone (adj.)
sounded or spoken in a tone unvarying in pitch;
Synonyms: flat / monotonic / monotonous
monotone (adj.)
of a sequence or function; consistently increasing and never decreasing or consistently decreasing and never increasing in value;
Synonyms: monotonic
From wordnet.princeton.edu