modal

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}]
    
from The Collaborative International Dictionary of English v.0.48
Modal \Mo"dal\, a. [Cf. F. modal. See {Mode}.]
   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. --Glanvill.
      [1913 Webster]

   2. (Logic & Metaph.) Indicating, or pertaining to, some mode
      of conceiving existence, or of expressing thought, such as
      the modes of possibility or obligation.
      [1913 Webster +PJC]

   3. (Gram.) Pertaining to or denoting mood.
      [PJC]
    
from The Collaborative International Dictionary of English v.0.48
Modal \Mo"dal\(Gram.), n.
   A modal auxiliary.
   [PJC]
    
from The Free On-line Dictionary of Computing (8 July 2008)
modal

   1. (Of an interface) Having {modes}.  Modeless interfaces are
   generally considered to be superior because the user does not
   have to remember which mode he is in.

   2. See {modal logic}.

   3. In {MS Windows} programming, A window with the label
   "WS_MODAL" will stay on the screen and claim all the
   user-input.  Other windows can only be accessed if the MODAL
   window is closed.  Such a window would typically be used for
   an error {dialog box} to warn the user for something
   important, like "Critical error, shut down the system and
   restart".

   (1995-02-07)
    

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