final phase Antonyms

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