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2.1
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smoothness
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From Wiktionary
Word parts
[
change
]
smooth
+
-ness
Noun
[
change
]
Singular
smoothness
Plural
smoothnesses
(
countable
&
uncountable
) The
smoothness
of something is
defined
as how
smooth
it is.
Antonym:
roughness
Related words
[
change
]
smooth
Categories
:
Terms suffixed with -ness
Nouns
Countable nouns
Uncountable nouns