mono-tone

monotone

[mon-uh-tohn]
noun
1.
a vocal utterance or series of speech sounds in one unvaried tone.
2.
a single tone without harmony or variation in pitch.
3.
recitation or singing of words in such a tone.
4.
a person who is unable to discriminate between or to reproduce differences in musical pitch, especially in singing.
5.
sameness of tone or color, sometimes to a boring degree.
adjective
7.
consisting of or characterized by a uniform tone of one color: a monotone drape. Compare monochromatic ( defs 1, 2 ).
8.
Mathematics, monotonic ( def 2 ).

Origin:
1635–45; < French monotone < Late Greek monótonos monotonous

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World English Dictionary
monotone (ˈmɒnəˌtəʊn)
 
n
1.  a single unvaried pitch level in speech, sound, etc
2.  utterance, etc, without change of pitch
3.  lack of variety in style, expression. etc
 
adj
4.  unvarying or monotonous
5.  maths Also: monotonic (of a sequence or function) consistently increasing or decreasing in value

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

monotone
"an unvarying tone in music or speaking," 1640s; see monotony. Related: Monotonic; monotonically.
Online Etymology Dictionary, © 2010 Douglas Harper
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