- Mean line
- Mean Mean, a. [OE. mene, OF. meiien, F. moyen, fr. L. medianus
that is in the middle, fr. medius; akin to E. mid. See
{Mid}.]
1. Occupying a middle position; middle; being about midway
between extremes.
[1913 Webster]
Being of middle age and a mean stature. --Sir. P. Sidney. [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 noon.

{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]

*The Collaborative International Dictionary of English.
2000.*

### Look at other dictionaries:

**Mean line**— In typography, the mean line, also (and more simply) known as midline, is the line that determines where non ascending lowercase letters terminate in a typeface. The distance between the baseline and the mean line is called the x height. Round… … Wikipedia**mean line**— Верхняя линия строчных знаков (Mean line) Воображаемая линия, проходящая по верху прямых строчных [буква по размеру меньше заглавной, иногда отличаются по рисунку] знаков без верхних выносных элементов [элемент буквы выступающий выше верхней… … Шрифтовая терминология**mean line**— pusiaukampinė statusas T sritis fizika atitikmenys: angl. bisecting line; bisector; mean line vok. Halbierungslinie, f; Winkelhalbierende, f rus. биссектриса, f pranc. bissectrice, f … Fizikos terminų žodynas**mean line**— A line joining the leading and trailing edges of an airfoil equidistant from the upper and lower surfaces. Also known as a camber line or a mean camber line … Aviation dictionary**mean line**— noun Etymology: mean (VII) : bisectrix * * * Print. an imaginary x high line. Also called x line … Useful english dictionary**mean line**— Print. an imaginary x high line. Also called x line. * * * … Universalium**Mean line**— Верхняя линия (строчных букв) … Краткий толковый словарь по полиграфии**mean line of advance**— In naval usage, the direction expected to be made good over a sustained period … Military dictionary**first mean line**— noun : acute bisectrix … Useful english dictionary**second mean line**— noun see obtuse bisectrix … Useful english dictionary