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The Collaborative International Dictionary of English v.0.48 (gcide)

Imperfect \Im*per"fect\ ([i^]m*p[~e]r"f[e^]kt), n. (Gram.)
The imperfect tense; or the form of a verb denoting the
imperfect tense.
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Imperfect \Im*per"fect\, v. t.
To make imperfect. [Obs.]
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Imperfect \Im*per"fect\, a. [L. imperfectus: pref. im- not
perfectus perfect: cf. F imparfait, whence OE. imparfit. See
{Perfect}.]
1. Not perfect; not complete in all its parts; wanting a
part; deective; deficient.
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Something he left imperfect in the state. --Shak.
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Why, then, your other senses grow imperfect. --Shak.
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2. Wanting in some elementary organ that is essential to
successful or normal activity.
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He . . . stammered like a child, or an amazed,
imperfect person. --Jer. Taylor.
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3. Not fulfilling its design; not realizing an ideal; not
conformed to a standard or rule; not satisfying the taste
or conscience; esthetically or morally defective.
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Nothing imperfect or deficient left
Of all that he created. --Milton.
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Then say not man's imperfect, Heaven in fault;
Say rather, man's as perfect as he ought. --Pope.
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{Imperfect arch}, an arch of less than a semicircle; a skew
arch.

{Imperfect cadence} (Mus.), one not ending with the tonic,
but with the dominant or some other chord; one not giving
complete rest; a half close.

{Imperfect consonances} (Mus.), chords like the third and
sixth, whose ratios are less simple than those of the
fifth and forth.

{Imperfect flower} (Bot.), a flower wanting either stamens or
pistils. --Gray.

{Imperfect interval} (Mus.), one a semitone less than
perfect; as, an imperfect fifth.

{Imperfect number} (Math.), a number either greater or less
than the sum of its several divisors; in the former case,
it is called also a {defective number}; in the latter, an
{abundant number}.

{Imperfect obligations} (Law), obligations as of charity or
gratitude, which cannot be enforced by law.

{Imperfect power} (Math.), a number which can not be produced
by taking any whole number or vulgar fraction, as a
factor, the number of times indicated by the power; thus,
9 is a perfect square, but an imperfect cube.

{Imperfect tense} (Gram.), a tense expressing past time and
incomplete action.
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Preterimperfect \Pre`ter*im*per"fect\, a. & n. [Pref. preter-
imperfect.] (Gram.)
Old name of the tense also called {imperfect}.
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