[1] : The Collaborative International Dictionary of English v.0.48

magnitude \mag"nitude\, n. l. magnitudo, from magnus great.
   see master, and cf. maxim.
   1. extent of dimensions; size; -- applied to things that have
      length, breadth, and thickness.
      1913 webster

            conceive those particles of bodies to be so disposed
            amongst themselves, that the intervals of empty
            spaces between them may be equal in magnitude to
            them all.                             --sir i.
                                                  newton.
      1913 webster

   2. geom. that which has one or more of the three
      dimensions, length, breadth, and thickness.
      1913 webster

   3. anything of which greater or less can be predicated, as
      time, weight, force, and the like.
      1913 webster

   4. greatness; grandeur. "with plain, heroic magnitude of
      mind." --milton.
      1913 webster

   5. greatness, in reference to influence or effect;
      importance; as, an affair of magnitude.
      1913 webster

            the magnitude of his designs.         --bp. horsley.
      1913 webster

   6. astron. see magnitude of a star, below.
      pjc

   apparent magnitude

   1. opt., the angular breadth of an object viewed as
      measured by the angle which it subtends at the eye of the
      observer; -- called also apparent diameter.

   2. astron. same as magnitude of a star, below.

   magnitude of a star astron., the rank of a star with
      respect to brightness. about twenty very bright stars are
      said to be of first magnitude, the stars of the sixth
      magnitude being just visible to the naked eye; called also
      visual magnitude, apparent magnitude, and simply
      magnitude. stars observable only in the telescope are
      classified down to below the twelfth magnitude. the
      difference in actual brightness between magnitudes is now
      specified as a factor of 2.512, i.e. the difference in
      brightness is 100 for stars differing by five magnitudes.
      1913 webster +pjc
see also:
master maxim magnitude of a star apparent magnitude apparent diameter magnitude of a star 
visual magnitude apparent magnitude magnitude 

Magnitude >> M Words
Magnitude, definition of term: Magnitude
magnitude_pag1.html

Visual >> V Words
Visual, definition of term: Visual
visual_pag1.html

Visual Cortex >> V Words
Visual Cortex, definition of term: Visual Cortex
visual+cortex_pag1.html

Visual Percepti >> V Words
Visual Percepti, definition of term: Visual Percepti
visual+percepti_pag1.html

Visual Communic >> V Words
Visual Communic, definition of term: Visual Communic
visual+communic_pag1.html

Visual Basic >> V Words
Visual Basic, definition of term: Visual Basic
visual+basic_pag1.html

Visual Acuity >> V Words
Visual Acuity, definition of term: Visual Acuity
visual+acuity_pag1.html

Visual C >> V Words
Visual C, definition of term: Visual C
visual+c_pag1.html