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Definition of derivation : 1. A drawing of humors or fluids from one part of the body to another, to relieve or lessen a morbid process.
2. A leading or drawing off of water from a stream or source.
3. That from which a thing is derived.
4. That which is derived; a derivative; a deduction.
5. 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.
6. The act of tracing origin or descent, as in grammar or genealogy; as, the derivation of a word from an Aryan root.
7. The formation of a word from its more original or radical elements; also, a statement of the origin and history of a word.
8. 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.
9. The state or method of being derived; the relation of origin when established or asserted.

Synonyms:

kin, spinoff, blood, fount, derivative, root, deriving, stock, descent, filiation, offshoot, etymologizing, etymology, byproduct, provenance, mother, lineage, parentage, well, rootstock, ancestry, blood line, provenience, bloodline, line, linage, parent, descendant, fountainhead, stemma, pedigree, outgrowth, line of descent, fountain

embryo, origin, inception, babyhood, dawn, introduction, conception, hatching, earliness, infancy, prelude, Genesis, source, precursor, birth, nascency, emergence, nativity, beginning, start, sprout, preparation, stem, inauguration, cradle, commencement, creation, spring

Usage examples:

• Instances might be indefinitely multiplied to show the derivation of similar customs interwoven with every act of social and domestic life.
• For a fuller list see the Chapter on Derivation. - "The English Language", Robert Gordon Latham.
• It will be noted that many of the names of Church Officers and many other terms having a technical Church meaning are Greek in their derivation. - "The Prayer Book Explained", Percival Jackson.