Normal

Definition of Normal

Nor´mal   Pronunciation: nôr´mal
a.1.
1.According to an established norm, rule, or principle; conformed to a type, standard, or regular form; performing the proper functions; not abnormal; regular; natural; analogical.
Deviations from the normal type.
2.(Geom.) According to a square or rule; perpendicular; forming a right angle; as, a line normal to the base. Specifically: Of or pertaining to a normal.
3.(Chem.) Standard; original; exact; typical.
 Normal equations (Method of Least Squares) a set of equations of the first degree equal in number to the number of unknown quantities, and derived from the observations by a specified process. The solution of the normal equations gives the most probable values of the unknown quantities.
 Normal group (Geol.) a group of rocks taken as a standard.
 Normal place (Astron.) the apparent place in the heavens of a planet or comet at a specified time, the place having been determined by a considerable number of observations, extending perhaps over many days, and so combined that the accidental errors of observation have largely balanced each other.- Lyell.
 Normal school a school whose methods of instruction are to serve as a model for imitation; an institution for the training of teachers.
n.1.(Geom.) Any perpendicular.
2.(Geom.) A straight line or plane drawn from any point of a curve or surface so as to be perpendicular to the curve or surface at that point.

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