资料来源 : Webster's Revised Unabridged Dictionary (1913)

Signal \Sig"nal\, a. [From signal, n.: cf. F. signal['e].]
   1. Noticeable; distinguished from what is ordinary; eminent;
      remarkable; memorable; as, a signal exploit; a signal
      service; a signal act of benevolence.

            As signal now in low, dejected state As erst in
            highest, behold him where he lies.    --Milton.

   2. Of or pertaining to signals, or the use of signals in
      conveying information; as, a signal flag or officer.

   {The signal service}, a bureau of the government (in the
      United States connected with the War Department) organized
      to collect from the whole country simultaneous raports of
      local meteorological conditions, upon comparison of which
      at the central office, predictions concerning the weather
      are telegraphed to various sections, where they are made
      known by signals publicly displayed.

   {Signal station}, the place where a signal is displayed;
      specifically, an observation office of the signal service.

   Syn: Eminent; remarkable; memorable; extraordinary; notable;
        conspicuous.