ETYM Latin imperfectus: pref. im- not + perfectus perfect: cf. F imparfait, whence Old Eng. imparfit. Related to Perfect.
Not perfect; defective or inadequate.

Množina: imperfects

An imperfect tense; also; the verb form expressing it.

Množina: imperfect competitions

Competition between firms that supply branded products. Firms therefore compete not just on price, as in perfect competition, but on the type of good they supply. In an oligopoly, the market is dominated by a few firms offering strongly branded products and new firms find it difficult to establish themselves in the industry, whereas in monopolistic competition there are many small firms, branding is weaker, and entry to the industry is easier.

Množina: imperfect fungis

Množina: imperfect fungi

Any of various fungi (order Fungi Imperfecti syn. Deuteromycetes) of which only the conidial stage is known.

Množina: imperfectibilities

The incapability of becoming perfect; SYN. imperfectability.

Množina: imperfections

ETYM Latin imperfectio: cf. French imperfection. Related to Imperfect.
The state or an instance of being imperfect; SYN. imperfectness.

Singular of imperfections is imperfection.

Of a verb form or aspect; expressing action as incomplete or without reference to completion or as reiterated — compare perfective

Množina: imperfectives

Aspect without regard to the beginning or completion of the action of the verb; SYN. imperfective aspect.

In an imperfect or faulty way; SYN. amiss.

Množina: imperfectnesses

Defectiveness, lack of perfection, imperfection