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[nawr-muh l] /ˈnɔr məl/
conforming to the standard or the common type; usual; not abnormal; regular; natural.
serving to establish a standard.
  1. approximately average in any psychological trait, as intelligence, personality, or emotional adjustment.
  2. free from any mental disorder; sane.
Biology, Medicine/Medical.
  1. free from any infection or other form of disease or malformation, or from experimental therapy or manipulation.
  2. of natural occurrence.
  1. being at right angles, as a line; perpendicular.
  2. of the nature of or pertaining to a mathematical normal.
  3. (of an orthogonal system of real functions) defined so that the integral of the square of the absolute value of any function is 1.
  4. (of a topological space) having the property that corresponding to every pair of disjoint closed sets are two disjoint open sets, each containing one of the closed sets.
  5. (of a subgroup) having the property that the same set of elements results when all the elements of the subgroup are operated on consistently on the left and consistently on the right by any element of the group; invariant.
  1. (of a solution) containing one equivalent weight of the constituent in question in one liter of solution.
  2. pertaining to an aliphatic hydrocarbon having a straight unbranched carbon chain, each carbon atom of which is joined to no more than two other carbon atoms.
  3. of or relating to a neutral salt in which any replaceable hydroxyl groups or hydrogen atoms have been replaced by other groups or atoms, as sodium sulfate, Na 2 SO 4 .
the average or mean:
Production may fall below normal.
the standard or type.
  1. a perpendicular line or plane, especially one perpendicular to a tangent line of a curve, or a tangent plane of a surface, at the point of contact.
  2. the portion of this perpendicular line included between its point of contact with the curve and the x- axis.
Origin of normal
1520-30; < Latin normālis made according to a carpenter's square, equivalent to norm(a) (see norm) + -ālis -al1
Related forms
normality, normalness, noun
antinormal, adjective
antinormalness, noun
antinormality, noun
half-normal, adjective
half-normally, adverb
hypernormal, adjective
hypernormally, adverb
hypernormalness, noun
hypernormality, noun
nonnormal, adjective
nonnormally, adverb
nonnormalness, noun
nonnormality, noun, plural nonnormalities.
overnormal, adjective
overnormally, adverb
overnormality, noun
quasi-normal, adjective
quasi-normally, adverb
seminormal, adjective
seminormally, adverb
seminormalness, noun
seminormality, noun
transnormal, adjective
transnormally, adverb
unnormal, adjective
unnormally, adverb
unnormalness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for normality
Contemporary Examples
Historical Examples
  • When his normality abandoned him, he avoided a greater tragedy.

    Fantazius Mallare Ben Hecht
  • The glory of his temperament was its splendid sanity, balance, and normality.

    Mark Twain Archibald Henderson
  • Her innocence of any wrong-doing in no way restored her to normality.

    Find the Woman

    Arthur Somers Roche
  • She was surprised into normality, and began to smile as she looked about her.

    Regiment of Women Clemence Dane
  • The striking thing about the abnormality of the Germans is its normality in amount.

    The Old World in the New Edward Alsworth Ross
British Dictionary definitions for normality


usual; regular; common; typical: the normal way of doing it, the normal level
constituting a standard: if we take this as normal
  1. being within certain limits of intelligence, educational success or ability, etc
  2. conforming to the conventions of one's group
(biology, med) (of laboratory animals) maintained in a natural state for purposes of comparison with animals treated with drugs, etc
(chem) (of a solution) containing a number of grams equal to the equivalent weight of the solute in each litre of solvent N
(chem) denoting a straight-chain hydrocarbon: a normal alkane. Prefix: n-, e.g. n-octane
(geometry) another word for perpendicular (sense 1)
the usual, average, or typical state, degree, form, etc
anything that is normal
(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
Derived Forms
normality (nɔːˈmælɪtɪ), especially (US) normalcy, noun
Word Origin
C16: from Latin normālis conforming to the carpenter's square, from normanorm
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for normality

1849, from normal + -ity. Perhaps influenced by French normalité (1834).



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.

Online Etymology Dictionary, © 2010 Douglas Harper
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normality in Medicine

normal nor·mal (nôr'məl)

  1. Conforming with, adhering to, or constituting a norm, standard, pattern, level, or type; typical.

  2. Functioning or occurring in a natural way; lacking observable abnormalities or deficiencies.

  3. Occurring naturally and not because of disease, inoculation, or any experimental treatment. Used of immunity.

  4. Of, relating to, or being a solution having one gram equivalent weight of solute per liter of solution.

  5. Of, relating to, or being an aliphatic hydrocarbon having a straight and unbranched chain of carbon atoms.

  6. Of, relating to, or characterized by average intelligence or development.

The usual or the expected state, form, amount, or degree.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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