noun
start of an event or action
Synonyms: alpha, basis, birth, blastoff, commencement, creation, dawn, dawning, day one, genesis, inauguration, inception, induction, infancy, initiation, installation, introduction, kickoff, onset, opener, opening, origin, origination, outset, point of departure, preface, prelude, presentation, rise, root, rudiment, source, spring, square one, starting point, takeoff, threshold, top
Antonyms: completion, conclusion, consummation, end, ending, finish, goal, termination
noun
origin, cause
Synonyms: antecedent, birth, conception, egg, embryo, font, fount, fountain, fountainhead, generation, genesis, germ, heart, principle, resource, root, seed, stem, well
Antonyms: conclusion, outcome, result