imperfect : Idioms & Phrases

• an arch of less than a semicircle; a skew arch.

Webster 1913

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

Webster 1913

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

Webster 1913

• (Bot.), a flower wanting either stamens or pistils. Gray.

Webster 1913

• (Mus.), one a semitone less than perfect; as, an imperfect fifth.

Webster 1913

• (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.

Webster 1913

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

Webster 1913

• (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.

Webster 1913

• noun a tense of verbs used in describing action that is on-going
  progressive tense; imperfect; progressive; continuous tense.
  

WordNet

• (Gram), a tense expressing past time and incomplete action.

Webster 1913