The Collaborative International Dictionary of English v.0.48:

Insight \In"sight`\, n.
   1. A sight or view of the interior of anything; a deep
      inspection or view; introspection; -- frequently used with
      into.
      [1913 Webster]

            He had an insight into almost all the secrets of
            state.                                --Jortin.
      [1913 Webster]

   2. Power of acute observation and deduction; penetration;
      discernment; perception.
      [1913 Webster]

            Quickest insight
            In all things that to greatest actions lead.
                                                  --Milton.
      [1913 Webster]

WordNet (r) 3.0 (2006):

insight
    n 1: clear or deep perception of a situation [syn:
         penetration, insight]
    2: a feeling of understanding [syn: insight, perceptiveness,
       perceptivity]
    3: the clear (and often sudden) understanding of a complex
       situation [syn: insight, brainstorm, brainwave]
    4: grasping the inner nature of things intuitively [syn:
       insight, sixth sense]

The Free On-line Dictionary of Computing (19 January 2023):

INSIGHT

   A simulation and modelling language especially for health
   care problems.

   ["Simulation Modeling with INSIGHT", S.D. Roberts Proc 1983
   Winter Sim Conf, S.D. Roberts et al eds, pp.7-16].

   (1995-03-03)