normal Definition

normal
adj

1. Usual; typical; not extraordinary.

Thesaurus: usual, ordinary, conventional, typical, accustomed, average, common, habitual, mainstream, regular, routine, standard, run-of-the-mill, par for the course; Antonym: irregular, odd, peculiar.
2. Mentally or physically sound.

Example: a normal baby
3. geom.
Perpendicular.
Form: normal to something
4. chem.
Said of a solution: a standard measurement of concentration, being a solution containing one equivalent weight of a dissolved substance per litre, eg 1N, 2N, etc.
5. chem.
Said of hydrocarbon molecules: containing a single unbranched chain of carbon atoms.
Example: n-butane
Example: n-propane
Form: n-

noun

1. What is average or usual.
2. geom.
A perpendicular line or plane.

Derivative: normally

In an ordinary or natural way.

Usually.
Thesaurus: usually, commonly, frequently, regularly, ordinarily, typically, habitually, as a rule.

Etymology: 15c: from Latin normalis regulated by a carpenter's square, from norma carpenter's square.