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2 definitions found
 for Diurnal aberration
From The Collaborative International Dictionary of English v.0.48 :

  Diurnal \Di*ur"nal\, a. [L. diurnalis, fr. dies day. See
     Deity, and cf. Journal.]
     1. Relating to the daytime; belonging to the period of
        daylight, distinguished from the night; -- opposed to
        nocturnal; as, diurnal heat; diurnal hours.
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     2. Daily; recurring every day; performed in a day; going
        through its changes in a day; constituting the measure of
        a day; as, a diurnal fever; a diurnal task; diurnal
        aberration, or diurnal parallax; the diurnal revolution of
        the earth.
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              Ere twice the horses of the sun shall bring
              Their fiery torcher his diurnal ring. --Shak.
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     3. (Bot.) Opening during the day, and closing at night; --
        said of flowers or leaves.
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     4. (Zool.) Active by day; -- applied especially to the eagles
        and hawks among raptorial birds, and to butterflies
        (Diurna) among insects.
        [1913 Webster]
     Diurnal aberration (Anat.), the aberration of light arising
        from the effect of the earth's rotation upon the apparent
        direction of motion of light.
     Diurnal arc, the arc described by the sun during the
        daytime or while above the horizon; hence, the arc
        described by the moon or a star from rising to setting.
     Diurnal circle, the apparent circle described by a
        celestial body in consequence of the earth's rotation.
     Diurnal motion of the earth, the motion of the earth upon
        its axis which is described in twenty-four hours.
     Diurnal motion of a heavenly body, that apparent motion of
        the heavenly body which is due to the earth's diurnal
     Diurnal parallax. See under Parallax.
     Diurnal revolution of a planet, the motion of the planet
        upon its own axis which constitutes one complete
     Syn: See Daily.
          [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Aberration \Ab`er*ra"tion\, n. [L. aberratio: cf. F. aberration.
     See Aberrate.]
     1. The act of wandering; deviation, especially from truth or
        moral rectitude, from the natural state, or from a type.
        "The aberration of youth." --Hall. "Aberrations from
        theory." --Burke.
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     2. A partial alienation of reason. "Occasional aberrations of
        intellect." --Lingard.
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              Whims, which at first are the aberrations of a
              single brain, pass with heat into epidemic form.
                                                    --I. Taylor.
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     3. (Astron.) A small periodical change of position in the
        stars and other heavenly bodies, due to the combined
        effect of the motion of light and the motion of the
        observer; called annual aberration, when the observer's
        motion is that of the earth in its orbit, and daily or
        diurnal aberration, when of the earth on its axis;
        amounting when greatest, in the former case, to 20.4'',
        and in the latter, to 0.3''. Planetary aberration is
        that due to the motion of light and the motion of the
        planet relative to the earth.
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     4. (Opt.) The convergence to different foci, by a lens or
        mirror, of rays of light emanating from one and the same
        point, or the deviation of such rays from a single focus;
        called spherical aberration, when due to the spherical
        form of the lens or mirror, such form giving different
        foci for central and marginal rays; and chromatic
        aberration, when due to different refrangibilities of the
        colored rays of the spectrum, those of each color having a
        distinct focus.
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     5. (Physiol.) The passage of blood or other fluid into parts
        not appropriate for it.
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     6. (Law) The producing of an unintended effect by the
        glancing of an instrument, as when a shot intended for A
        glances and strikes B.
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     Syn: Insanity; lunacy; madness; derangement; alienation;
          mania; dementia; hallucination; illusion; delusion. See
          [1913 Webster]

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