DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   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"
       n 1: an auxiliary verb (such as `can' or `will') that is used to
            express modality [syn: modal auxiliary verb, modal
    auxiliary, modal verb, modal]