mod·al /ˈmodḷ/
  (a.)模態的形式的,樣式的,形態上的
  modal
  模態
  Mo·dal a.
  1. Of or pertaining to a mode or mood; consisting in mode or form only; relating to form; having the form without the essence or reality.
  2. Logic & Metaph. Indicating, or pertaining to, some mode of conceiving existence, or of expressing thought, such as the modes of possibility or obligation.
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  modal
       adj 1: relating to or constituting the most frequent value in a
              distribution; "the modal age at which American
              novelists reach their peak is 30" [syn: modal(a), average]
       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"