modality - definition and synonyms

noun 

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/məʊˈdæləti/
singularmodality
pluralmodalities
  1. 1
    [uncountable] linguistics the ways in which people talk about their attitudes, obligations, and intentions. In English, modality is expressed by modal verbs such as ‘can’, ‘might’, and ‘should’, or by expressions such as ‘It’s likely that’, ‘I’m supposed to’, and ‘I’d better’.
    See also modal verb
  2. 2
    [countable] formal the way in which something exists, is experienced or is done

    We call on this Congress to work out the modalities of the consumer boycott.