Webster's English Dictionary

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modality

mo.dal.i.ty \mo--'dal-*t-e-\ n 1a: the quality or state of being modal  1b: 
   a modal quality or attribute : FORM  2: the classification of logicla 
   propositions according to their asserting  or denying the possibility, 
   impossibility, contingency, or necessity of their content 3: a therapeutic 
   agency; esp : one used in physical therapy