(1):

(n.) That from which a thing is derived.

(2):

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

(3):

(n.) The formation of a word from its more original or radical elements; also, a statement of the origin and history of a word.

(4):

(n.) That which is derived; a derivative; a deduction.

(5):

(n.) 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.

(6):

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

(7):

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

(8):

(n.) 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.

(9):

(n.) The act of tracing origin or descent, as in grammar or genealogy; as, the derivation of a word from an Aryan root.