to·​nic·​i·​ty | \ tō-ˈni-sə-tē How to pronounce tonicity (audio) \

Definition of tonicity

1 : the property of possessing tone especially : healthy vigor of body or mind
2 : muscular tonus

Examples of tonicity in a Sentence

Recent Examples on the Web

That’s right—the key to losing inches off your waistline lies within a petite Parisian, fond of magenta lipstick and headbands, whose unique rémodelage technique is said to reshape silhouettes, reduce cellulite, boost tonicity, and release toxins. Zoe Ruffner, Vogue, "This Slimming Massage is the French-Girl Secret to a Better Beach Body," 27 June 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'tonicity.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of tonicity

1824, in the meaning defined at sense 1

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Dictionary Entries near tonicity


tonic accent



tonic sol-fa

tonic water


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The first known use of tonicity was in 1824

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to·​nic·​i·​ty | \ tō-ˈnis-ət-ē How to pronounce tonicity (audio) \
plural tonicities

Medical Definition of tonicity

1 : the property of possessing tone especially : healthy vigor of body or mind
3 : the osmotic pressure of a solution the cells swell and shrink with changing tonicity of the environment

More from Merriam-Webster on tonicity

Rhyming Dictionary: Words that rhyme with tonicity

Britannica English: Translation of tonicity for Arabic Speakers

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