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 aryan 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.-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.-a drawing of humors or fluids from one part of the body to another, to relieve or lessen a morbid process.