(grammar) A tense used to express an ongoing action completed after some time in the future. In English it is formed by use of will have been (or shall have been) and a present participle.

(grammar) A tense that expresses an unbroken action continuing at the present time, started in the past. In English it is formed by using have been with a present participle.

Insistence on perfection often precludes the opportunity for something worthwhile. / Insistence on perfection precludes gradual improvement through compromises.

plural of present perfect progressive

A scenario that can be found in market dominated by a monopoly firm which is able to charge each consumer different prices based on certain characteristics.

Alternative form of perfect is the enemy of good

Alternative form of perfect is the enemy of good

A test that measures a binary value without error.

plural of perfect gold standard test

(idiomatic) To insist on the total realization of a goal and reject any compromise, thereby decreasing the chance of achieving even a part of that goal.