Derivation meaning : 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. (genealogy) The act of tracing origin or descent. (grammar) Forming a new word by changing the base of another word or by adding affixes to it. 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 a fixed definition, referred to as derivation or differentiation; this is the inverse operation to integration. A drawing of humors or fluids from one part of the body to another, to relieve or lessen a morbid process.