Dictionary > English Dictionary > Definition, synonym and antonym of normal
Meaning of normal by Wiktionary Dictionary



    From Latin normalis .


    • ( UK ) IPA: /nɔː( ɹ ).məl/, X-SAMPA: /nO:( r ).m@l/
    • Rhymes: -ɔː( r )məl


    normal ( comparative more normal, superlative most normal )

    1. According to norms or rules .
      Organize the data into third normal form .
    2. Usual; ordinary
      Felicia baked the bread the normal way .
    3. Healthy; not sick or ill
      John is feeling normal again .
    4. Pertaining to a school to teach teachers how to teach .
      My grandmother attended Mankato State Normal School .
    5. ( chemistry ) of, relating to, or being a solution containing one equivalent weight of solute per litre of solution .
    6. ( organic chemistry ) Describing a straight chain isomer of an aliphatic hydrocarbon, or an aliphatic compound in which a substituent is in the 1- position of such a hydrocarbon
    7. ( physics ) ( Of a mode in an oscillating system ) In which all parts of an object vibrate at the same frequency; See normal mode
    8. ( geometry ) Perpendicular to a tangent line or derivative of a surface in Euclidean space .
      The interior normal vector of a ideal perfect sphere will always point toward the center, and the exterior normal vector directly away, and both will always be co-linear with the ray whose' tip ends at the point of intersection, which is the intersection of all three sets of points .
    9. ( algebra ) ( Of a subgroup ) whose cosets form a group
    10. ( algebra ) ( Of a field extension of a field K ) which is the splitting field of a family of polynomials in K
    11. ( probability theory, statistics ) ( Of a distribution ) which has a very specific bell curve shape
    12. ( complex analysis ) ( Of a family of continuous functions ) which is pre-compact
    13. ( set theory ) ( Of a function from the ordinals to the ordinals ) which is strictly monotonically increasing and continuous with respect to the order topology
    14. ( linear algebra ) ( Of a matrix ) which commutes with its conjugate transpose
    15. ( functional analysis ) ( Of a Hilbert space operator ) which commutes with its adjoint
    16. ( category theory ) ( Of an epimorphism ) which is the cokernel of some morphism
    17. ( category theory ) ( Of a monomorphism ) which is the kernel of some morphism
    18. ( category theory ) ( Of a morphism ) which is a normal epimorphism or a normal monomorphism
    19. ( category theory ) ( Of a category ) in which every monomorphism is normal
    20. ( Of a real number ) whose digits, in any base representation, enjoy a uniform distribution
    21. ( topology ) ( Of a topology ) in which disjoint closed sets can be separated by disjoint neighborhoods
    22. ( rail transport, of points ) in the default position, set for the most frequently used route .



    Derived terms

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    Usage notes


    normal ( plural: normals )

    1. ( geometry ) A line or vector that is perpendicular to another line, surface, or plane .
    2. ( slang ) A person who is normal, who fits into mainstream society, as opposed to those who live alternative lifestyles .

Explanation of normal by Wordnet Dictionary


    1. conforming with or constituting a norm or standard or level or type or social norm

    2. serve wine at normal room temperature
      normal diplomatic relations
      normal working hours
      normal word order
      normal curiosity
      the normal course of events
    3. being approximately average or within certain limits in e.g. intelligence and development

    4. a perfectly normal child
      of normal intelligence
      the most normal person I've ever met
    5. in accordance with scientific laws

    6. forming a right angle

    1. something regarded as a normative example

    Definition of normal by GCIDE Dictionary


    1. Normal ( nôrmal ), a. [L. normalis, fr. norma rule, pattern, carpenter's square; prob. akin to noscere to know; cf. Gr. γνώριμος well known, γνώμων gnomon, also, carpenter's square: cf. F. normal. See Known, and cf. Abnormal, Enormous.]

      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. Hallam.

      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. Specifically: ( Quantitative Analysis ) 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. ( Chem. ) 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. ( Organ. Chem. ) Denoting that series of hydrocarbons in which no carbon atom is bound to more than two other carbon atoms; as, “normal pentane, hexane, etc.” Cf. Iso-.

      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. Lyell. -- Normal place ( of a planet or comet ) ( 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. -- Normal school, a school whose methods of instruction are to serve as a model for imitation; an institution for the training of teachers.

      Syn. -- Normal, Regular, Ordinary. Regular and ordinary are popular terms of well-known signification; normal has now a more specific sense, arising out of its use in science. A thing is normal, or in its normal state, when strictly conformed to those principles of its constitution which mark its species or to the standard of a healthy and natural condition. It is abnormal when it departs from those principles.

    2. Normal ( nôrmal ), n. [Cf. F. normale, ligne normale. See Normal, a.]
      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.

      ☞ The term normal is also used to denote the distance along the normal line from the curve to the axis of abscissas or to the center of curvature.