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 for Mean noon
From The Collaborative International Dictionary of English v.0.48 :

  Mean \Mean\, a. [OE. mene, OF. meiien, F. moyen, fr. L. medianus
     that is in the middle, fr. medius; akin to E. mid. See
     1. Occupying a middle position; middle; being about midway
        between extremes.
        [1913 Webster]
              Being of middle age and a mean stature. --Sir. P.
        [1913 Webster]
     2. Intermediate in excellence of any kind.
        [1913 Webster]
              According to the fittest style of lofty, mean, or
              lowly.                                --Milton.
        [1913 Webster]
     3. (Math.) Average; having an intermediate value between two
        extremes, or between the several successive values of a
        variable quantity during one cycle of variation; as, mean
        distance; mean motion; mean solar day.
        [1913 Webster]
     Mean distance (of a planet from the sun) (Astron.), the
        average of the distances throughout one revolution of the
        planet, equivalent to the semi-major axis of the orbit.
     Mean error (Math. Phys.), the average error of a number of
        observations found by taking the mean value of the
        positive and negative errors without regard to sign.
     Mean-square error, or Error of the mean square (Math.
        Phys.), the error the square of which is the mean of the
        squares of all the errors; -- called also, mean square
        deviation, mean error.
     Mean line. (Crystallog.) Same as Bisectrix.
     Mean noon, noon as determined by mean time.
     Mean proportional (between two numbers) (Math.), the square
        root of their product.
     Mean sun, a fictitious sun supposed to move uniformly in
        the equator so as to be on the meridian each day at mean
     Mean time, time as measured by an equable motion, as of a
        perfect clock, or as reckoned on the supposition that all
        the days of the year are of a mean or uniform length, in
        contradistinction from apparent time, or that actually
        indicated by the sun, and from sidereal time, or that
        measured by the stars.
        [1913 Webster]

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