(philately) An imperforated stamp.

(grammar) Abbreviation of imperfect. / (philately) Clipping of imperforate or imperforated.

plural of imperf

something having a minor flaw / (grammar) a tense of verbs used in describing a past action that is incomplete or continuous

(transitive) to make imperfect

not perfect / (botany) unisexual: having either male (with stamens) or female (with pistil) flowers, but not with both. / (taxonomy) known or expected to be polyphyletic, as of a form taxon.

(grammar) A tense used to describe a past action that is ongoing, incomplete or continuous, or coincident with another action.

(grammar) The imperfect tense in the subjunctive mood.

The imperfect tense in the indicative mood

(uncountable) Those qualities or features that are imperfect; the characteristic, state, or quality of being imperfect.