What is the meaning of Imperfect?

not perfect

unisexual: having either male (with stamens) or female (with pistil) flowers, but not with both.

known or expected to be polyphyletic, as of a form taxon.

lacking some elementary organ that is essential to successful or normal activity.

belonging to a tense of verbs used in describing a past action that is incomplete or continuous

something having a minor flaw

a tense of verbs used in describing a past action that is incomplete or continuous

to make imperfect

imperfect (not perfect)

imperfect

Source: wiktionary.org