final stage Antonyms

materialization prolegomenon root rudiment semen setout solemnization souce source spring springboard start start-up prodrome presentation prelude nascency occurrence onset opening opener ordination origin origination outpour outset outstart overture stolon taproot theophany get-go fountainhead provenance provenience knowledgeableness aquifer reference point launch pad lead-in blastoff POB initialization send-off kickoff baseline threshold verge wellhead wellspring