If something conforms to a general pattern, standard, or average, we describe it as normal, but of course that standard can change over time. What's normal today may be "abnormal" in the future.

The word normal comes from a Latin word normalis, which described something made with a carpenter's square. Something built this way would be normed to have angles that were perfectly aligned and fit a general pattern. This meaning eventually gave us the broader sense of fitting a pattern, standard, or average. Doctors like you to be a normal weight for your height, so you may need to grow taller to make your doctor happy.

Definitions of normal
  1. adjective
    being approximately average or within certain limits in e.g. intelligence and development
    “a perfectly normal child”
    “of normal intelligence”
    “the most normal person I've ever met”
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    departing from the normal in e.g. intelligence and development
    deviating widely from a norm of physical or mental ability; used especially of children below normal in intelligence
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  2. adjective
    conforming with or constituting a norm or standard or level or type or social norm; not abnormal
    “serve wine at normal room temperature”
    normal diplomatic relations”
    normal working hours”
    normal word order”
    normal curiosity”
    “the normal course of events”
    average, mean
    approximating the statistical norm or average or expected value
    average, median
    relating to or constituting the middle value of an ordered set of values (or the average of the middle two in a set with an even number of values)
    average, modal
    relating to or constituting the most frequent value in a distribution
    functioning or occurring in a normal way; lacking abnormalities or deficiencies
    not deviating from what is normal
    conforming to a type
    mentally healthy; free from mental disorder
    conforming to or constituting a standard of measurement or value; or of the usual or regularized or accepted kind
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    abnormal, unnatural
    not normal; not typical or usual or regular or conforming to a norm
    aberrant, deviant, deviate
    markedly different from an accepted norm
    deviating from the general or common order or type
    conducting nerve impulses in a direction opposite to normal
    atypical, irregular
    deviating from normal expectations; somewhat odd, strange, or abnormal
    brachydactylic, brachydactylous
    having abnormally short finger or toes
    markedly subnormal in structure or function or intelligence or behavior
    characteristic of a freak
    kinky, perverted
    (used of sexual behavior) showing or appealing to bizarre or deviant tastes
    below normal or average
    exceeding the normal or average
    occurring in an abnormal part of the body instead of the usual site involved in that function
    afflicted with or characteristic of mental derangement
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  3. adjective
    in accordance with scientific laws
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    not in accordance with scientific laws
    not in accordance with or determined by nature; contrary to nature
    beyond normal physical explanation
    psychic, psychical
    outside the sphere of physical science
    moving an object without apparent use of physical means
    supernormal, supranormal
    beyond the range of the normal or scientifically explainable
    extrasensory, paranormal
    seemingly outside normal sensory channels
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  4. noun
    something regarded as a normative example
    synonyms: convention, formula, pattern, rule
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    (sociology) the conventions that embody the fundamental values of a group
    code of behavior, code of conduct
    a set of conventional principles and expectations that are considered binding on any person who is a member of a particular group
    a behavioral convention or pattern characteristic of all members of a particular culture or of all human beings
    courtly love
    (Middle Ages) a highly conventionalized code of conduct for lovers
    knight errantry
    (Middle Ages) the code of conduct observed by a knight errant who is wandering in search of deeds of chivalry
    code of correct conduct
    type of:
    knowledge of how something is usually done
  5. adjective
    forming a right angle
    intersecting at or forming right angles
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