Noun

(en-noun)

The point of complete depletion, of the state of being used up.

Supreme tiredness; having exhausted energy.

* {{quote-book, year=1963, author=(Margery Allingham), title=(The China Governess)

, chapter=19 citation , passage=As soon as Julia returned with a constable, Timothy, who was on the point of exhaustion , prepared to give over to him gratefully. The newcomer turned out to be a powerful youngster, fully trained and eager to help, and he stripped off his tunic at once.}}

(dated, chemistry) The removal (by percolation etc) of an active medicinal constituent from plant material.

(dated, physics) The removal of all air from a vessel (the creation of a vacuum).

(maths) An exhaustive procedure