final phase Antonyms

onset rudiment setout solemnization souce source sperm spring springboard start stolon root prolegomenon prelude opening opener ordination origin origination outgoer outset outstart overture preface taproot threshold verge provenance provenience knowledgeableness aquifer reference point lead-in blastoff POB initialization countdown fountainhead get-go send-off wellhead wellspring run up materialisation liftoff takeoff nascence bloodline point of departure kickoff