SYN: Source, commencement, spring, cause, derivation, rise, beginning.
ANT: Termination, conclusion, extinction.
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KEY: Original.
SYN: Primary, initiatory, primordial, peculiar, pristine, ancient, former, first.
ANT: Subsequent, terminal, modern, later, derivative.
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KEY: Originate.
SYN: Commence, spring, rise, start, initiate, invent, create, cause to be made, proceed, emanate.
ANT: Prosecute, conduct, apply.