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Definition of origin : 1. That from which anything primarily proceeds; the fountain; the spring; the cause; the occasion.
2. The first existence or beginning of anything; the birth.
3. The point of attachment or end of a muscle which is fixed during contraction; - in contradistinction to insertion.

Synonyms:

antecedent, nascence, starting, note, offset, crinkle, rake, line of merchandise, bloodline, filiation, production line, rise, contrast, theme, fountain, seam, author, business, reference, telephone line, melodic phrase, declination, well, institution, outbreak, gunstock, parenthood, kickoff, mother, dividing line, entrance, arising, neckcloth, informant, assembly line, first, melodic line, innovation, onset, channel, ascendent, fund, shoot, telephone circuit, descent, tooth root, personal credit line, showtime, starting time, agate line, livestock, line of business, declension, initiation, business line, wrinkle, ascendant, farm animal, transmission line, origination, get-go, founding, crease, genealogy, pipeline, line of reasoning, etymon, line, breed, extraction, issue, ancestry, logical argument, reservoir, bank line, strain, pedigree, personal line of credit, ascent, foundation, fountainhead, melody, inventory, stock certificate, precede, fount, profligate, family, forge, blood, communication channel, generator, rootage, root word, store, provenance, tune, subscriber line, lineage, rip, kin, germ, instauration, seed, caudex, roue, ancestor, radical, inlet, product line, phone line, base, outset, rail line, solution, womb, opening, broth, etymology, ingress, sapling, rakehell, declivity, fall, blood line, short letter, linage, job, air, stemma, argument, root, outcome, occupation, cable, parentage, line of products, credit line, line of credit, railway line, invention, furrow, gillyflower, twig, simple eye, portal, end, close, rootstock, ocellus, decline, downslope, demarcation, root system, course, provenience, birthplace, door, line of work, line of descent, billet, entry, argumentation, stock

beginning (part of speech: noun)

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

cause (part of speech: verb)

heart, egg, producer, parent, occasion, conclusion, mainspring, agent, element, impulse, result, nucleus, motive, consequence, sperm, prime mover, progenitor, creator

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