Noun

(en noun)

A leading or drawing off of water from a stream or source.

The act of receiving anything from a source; the act of procuring an effect from a cause, means, or condition, as profits from capital, conclusions or opinions from evidence.

The act of tracing origin or descent, as in grammar or genealogy; as, the derivation of a word from an Indo-European root.

The state or method of being derived; the relation of origin when established or asserted.

That from which a thing is derived.

That which is derived; a derivative; a deduction.

(mathematics) The operation of deducing one function from another according to some fixed law, called the law of derivation, as the of differentiation or of integration.

(medicine) A drawing of humors or fluids from one part of the body to another, to relieve or lessen a morbid process.

Noun

(en-noun)

(mathematics, uncountable) The act or process of calculating.

(mathematics, countable) The result of calculating.

* {{quote-magazine, date=2012-01

, author=Michael Riordan , title=Tackling Infinity , volume=100, issue=1, page=86 , magazine= citation , passage=Some of the most beautiful and thus appealing physical theories, including quantum electrodynamics and quantum gravity, have been dogged for decades by infinities that erupt when theorists try to prod their calculations into new domains. Getting rid of these nagging infinities has probably occupied far more effort than was spent in originating the theories.}}

(countable) Reckoning, estimate.

By my calculation, we should be there by midnight.

(countable) An expectation based on circumstances.