Definition of normal

• a. - 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.
• a. - According to a square or rule; perpendicular; forming a right angle. Specifically: Of or pertaining to a normal.
• a. - Standard; original; exact; typical.
• a. - Denoting a solution of such strength that every cubic centimeter contains the same number of milligrams of the element in question as the number of its molecular weight.
• a. - Denoting certain hypothetical compounds, as acids from which the real acids are obtained by dehydration; thus, normal sulphuric acid and normal nitric acid are respectively S(OH)6, and N(OH)5.
• a. - Denoting that series of hydrocarbons in which no carbon atom is united with more than two other carbon atoms; as, normal pentane, hexane, etc. Cf. Iso-.
• a. - Any perpendicular.
• a. - 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.