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The Collaborative International Dictionary
Imperfect obligations

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.

    Something he left imperfect in the state.
    --Shak.

    Why, then, your other senses grow imperfect.
    --Shak.

  2. Wanting in some elementary organ that is essential to successful or normal activity.

    He . . . stammered like a child, or an amazed, imperfect person.
    --Jer. Taylor.

  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.

    Nothing imperfect or deficient left Of all that he created.
    --Milton.

    Then say not man's imperfect, Heaven in fault; Say rather, man's as perfect as he ought.
    --Pope.

    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.