exhaustion

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The act or an instance of exhausting.
2. n. The state of being exhausted; extreme fatigue: The runner collapsed from exhaustion.

Century Dictionary and Cyclopedia

1. n. The act of exhausting, or of drawing out or draining off; the act of emptying completely of the contents.
2. n. The state of being exhausted or emptied, or of being deprived of strength or energy.
3. n. Specifically In geometry, a method formerly used for demonstrating the properties of curvilinear areas. Two such areas, as P and Q, being given, it is shown that there is a series of rectilinear constructions, x₁, x₂, etc., all less than P, but each after the first differing from it by less than half as much as the one preceding it in the series. Suppose there is another series of constructions, y₁, y₂, etc., related in the same way to Q. Then, if x₁:y₁ = x₂:y₂ = etc., it will follow that x₁:y₁ = P:Q. The standard example of this method is the second proposition of the twelfth book of Euclid.
4. n. In logic, a method of proof in which all the arguments tending to an opposite conclusion are brought forward, discussed, and proved untenable or absurd, thus leaving the original proposition established by the exclusion of every alternative.
5. n. In physics, the act of removing the air from a receiver, as by an air-pump, or the extent to which the process has been carried.
6. n. In chem., the process of completely extracting from a substance whatever is removable by a given solvent, or the state of being thus completely deprived of certain soluble matters.

Wiktionary

1. n. The point of complete depletion, of the state of being used up.
2. n. Supreme tiredness; having exhausted energy.
3. n. dated, chemistry The removal (by percolation etc) of an active medicinal constituent from plant material
4. n. dated, physics The removal of all air from a vessel (the creation of a vacuum)

GNU Webster's 1913

1. n. The act of draining out or draining off; the act of emptying completely of the contents.
2. n. The state of being exhausted or emptied; the state of being deprived of strength or spirits.
3. n. (Math.) An ancient geometrical method in which an exhaustive process was employed. It was nearly equivalent to the modern method of limits.

WordNet 3.0

1. n. extreme fatigue
2. n. the act of exhausting something entirely
3. n. serious weakening and loss of energy