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3 definitions found
 for Personal equation
From The Collaborative International Dictionary of English v.0.48 :

  Personal \Per"son*al\ (p[~e]r"s[u^]n*al), a. [L. personalis: cf.
     F. personnel.]
     1. Pertaining to human beings as distinct from things.
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              Every man so termed by way of personal difference.
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     2. Of or pertaining to a particular person; relating to, or
        affecting, an individual, or each of many individuals;
        peculiar or proper to private concerns; not public or
        general; as, personal comfort; personal desire.
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              The words are conditional, -- If thou doest well, --
              and so personal to Cain.              --Locke.
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     3. Pertaining to the external or bodily appearance;
        corporeal; as, personal charms. --Addison.
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     4. Done in person; without the intervention of another.
        "Personal communication." --Fabyan.
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              The immediate and personal speaking of God. --White.
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     5. Relating to an individual, his character, conduct,
        motives, or private affairs, in an invidious and offensive
        manner; as, personal reflections or remarks.
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     6. (Gram.) Denoting person; as, a personal pronoun.
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     Personal action (Law), a suit or action by which a man
        claims a debt or personal duty, or damages in lieu of it;
        or wherein he claims satisfaction in damages for an injury
        to his person or property, or the specific recovery of
        goods or chattels; -- opposed to real action.
     Personal equation. (Astron.) See under Equation.
     Personal estate or Personal property (Law), movables;
        chattels; -- opposed to real estate or real property.
        It usually consists of things temporary and movable,
        including all subjects of property not of a freehold
     Personal identity (Metaph.), the persistent and continuous
        unity of the individual person, which is attested by
     Personal pronoun (Gram.), one of the pronouns I, thou,
        he, she, it, and their plurals.
     Personal representatives (Law), the executors or
        administrators of a person deceased.
     Personal rights, rights appertaining to the person; as, the
        rights of a personal security, personal liberty, and
        private property.
     Personal tithes. See under Tithe.
     Personal verb (Gram.), a verb which is modified or
        inflected to correspond with the three persons.
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From The Collaborative International Dictionary of English v.0.48 :

  Equation \E*qua"tion\, n. [L. aequatio an equalizing: cf. F.
     ['e]quation equation. See Equate.]
     1. A making equal; equal division; equality; equilibrium.
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              Again the golden day resumed its right,
              And ruled in just equation with the night. --Rowe.
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     2. (Math.) An expression of the condition of equality between
        two algebraic quantities or sets of quantities, the sign =
        being placed between them; as, a binomial equation; a
        quadratic equation; an algebraic equation; a
        transcendental equation; an exponential equation; a
        logarithmic equation; a differential equation, etc.
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     3. (Astron.) A quantity to be applied in computing the mean
        place or other element of a celestial body; that is, any
        one of the several quantities to be added to, or taken
        from, its position as calculated on the hypothesis of a
        mean uniform motion, in order to find its true position as
        resulting from its actual and unequal motion.
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     Absolute equation. See under Absolute.
     Equation box, or Equational box, a system of differential
        gearing used in spinning machines for regulating the twist
        of the yarn. It resembles gearing used in equation clocks
        for showing apparent time.
     Equation of the center (Astron.), the difference between
        the place of a planet as supposed to move uniformly in a
        circle, and its place as moving in an ellipse.
     Equations of condition (Math.), equations formed for
        deducing the true values of certain quantities from others
        on which they depend, when different sets of the latter,
        as given by observation, would yield different values of
        the quantities sought, and the number of equations that
        may be found is greater than the number of unknown
     Equation of a curve (Math.), an equation which expresses
        the relation between the co["o]rdinates of every point in
        the curve.
     Equation of equinoxes (Astron.), the difference between the
        mean and apparent places of the equinox.
     Equation of payments (Arith.), the process of finding the
        mean time of payment of several sums due at different
     Equation of time (Astron.), the difference between mean and
        apparent time, or between the time of day indicated by the
        sun, and that by a perfect clock going uniformly all the
        year round.
     Equation clock or Equation watch, a timepiece made to
        exhibit the differences between mean solar and apparent
        solar time. --Knight.
     Normal equation. See under Normal.
     Personal equation (Astron.), the difference between an
        observed result and the true qualities or peculiarities in
        the observer; particularly the difference, in an average
        of a large number of observation, between the instant when
        an observer notes a phenomenon, as the transit of a star,
        and the assumed instant of its actual occurrence; or,
        relatively, the difference between these instants as noted
        by two observers. It is usually only a fraction of a
        second; -- sometimes applied loosely to differences of
        judgment or method occasioned by temperamental qualities
        of individuals.
     Theory of equations (Math.), the branch of algebra that
        treats of the properties of a single algebraic equation of
        any degree containing one unknown quantity.
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From WordNet (r) 3.0 (2006) :

  personal equation
      n 1: variability attributable to individual differences

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