See initial in Webster's New World Roget's A-Z Thesaurus II
adjective
Of, relating to, or occurring at the start of something:
beginning, inceptive, incipient, initiatory, introductory, leadoff. See startAt or near the start of a period, development, or series:
beginning, early, first. See startPreceding all others in time:
earliest, first, maiden, original, pioneer, primary, prime, primordial. See start
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