modal

Noun

  1. an auxiliary verb (such as can’ orwill’) that is used to express modality

Adjective

  1. relating to or constituting the most frequent value in a distribution; “the modal age at which American novelists reach their peak is 30”
  2. of or relating to a musical mode; especially written in an ecclesiastical mode
  3. relating to or expressing the mood of a verb; “modal auxiliary”