ex·pan·siv·i·ty

[ek-span-siv-i-tee]
noun
1.
the quality or state of being expansive; expansiveness.

Origin:
1830–40; expansive + -ity

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
expansivity (ˌɛkspænˈsɪvɪtɪ) [Click for IPA pronunciation guide]
 
n
1.  the quality of being expansive
2.  another name for coefficient of expansion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
expansivity is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a chattering or flighty, light-headed person.
Example sentences
The rotors, casing and shafts are constructed from low expansivity materials.
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