This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Normal firmness or functional readiness in body tissues or organs.

n. The sustained partial contraction of resting or relaxed muscles.

n. The normal presence of tone or tension in a muscle or organ; tonus

n. The ability of a solution to exert an osmotic pressure upon a membrane

n. The state of healthy tension or partial contraction of muscle fibers while at rest; tone; tonus.

n. In zoology, occasionally employed to denote the quality of dead, as well as living, tissue.

n. Tone; the state or property of possessing tone or of being tonic; specifically, in physiol; the elasticity of living parts—a property of the muscles which is distinct from true irritability, and determines the general tone of the solids.

n. In music. See the quotation.

n. the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli

"According to the invite, socials will arrive for a cocktail hour to sample Talika's Bust Serum, which "after six weeks, increases the bra cup size by one cup, provides an 18% lift and, in many cases, improves tonicity.""

tautness    tenseness    tensity    tension   

arterial tonicity   

hypotonic    hypertonic    isotonic   

myotonia    hypertonia    muscle tone    hypotonicity    hypertonicity    hypertonus    hypotonus    catatonia    hypotonia    muscular tonus   

tone    tonus   

myosin    apatite    beamwidth    interleave    doping    preclear    denaturation    turgidity    consecutus    growth