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[nawr-muh l] /ˈnɔr məl/

adjective
1.
conforming to the standard or the common type; usual; not abnormal; regular; natural.
2.
serving to establish a standard.
3.
Psychology.

4.
Biology, Medicine/Medical.

5.
Mathematics.

6.
Chemistry.

noun
7.
the average or mean:
Production may fall below normal.
8.
the standard or type.
9.
Mathematics.

/ˈnɔːməl/
adjective
1.
usual; regular; common; typical: the normal way of doing it, the normal level
2.
constituting a standard: if we take this as normal
3.
(psychol)

4.
(biology, med) (of laboratory animals) maintained in a natural state for purposes of comparison with animals treated with drugs, etc
5.
(chem) (of a solution) containing a number of grams equal to the equivalent weight of the solute in each litre of solvent N
6.
(chem) denoting a straight-chain hydrocarbon: a normal alkane. Prefix: n-, e.g. n-octane
7.
(geometry) another word for perpendicular (sense 1)
noun
8.
the usual, average, or typical state, degree, form, etc
9.
anything that is normal
10.
(geometry) a line or plane perpendicular to another line or plane or to the tangent of a curved line or plane at the point of contact
adj.

c.1500, “typical, common;” 1640s, “standing at a right angle,” from Late Latin normalis “in conformity with rule, normal,” from Latin normalis “made according to a carpenter’s square,” from norma “rule, pattern,” literally “carpenter’s square” (see norm). Meaning “conforming to common standards, usual” is from 1828, but probably older than the record [Barnhart].

As a noun meaning “usual state or condition,” from 1890. Sense of “normal person or thing” is from 1894. Normal school (1834) is from French école normale (1794), a republican foundation. The city of Normal, Illinois, U.S., was named 1857 for the normal school established there.

normal nor·mal (nôr’məl)
adj.

n.
The usual or the expected state, form, amount, or degree.