opening
n
1 aperture, breach, break, chink, cleft, crack, fissure, gap, hole, interstice, orifice, perforation, rent, rupture, slot, space, split, vent
2 break (informal) chance, look-in (informal) occasion, opportunity, place, vacancy, window
3 beginning, birth, commencement, dawn, inauguration, inception, initiation, kickoff (informal) launch, launching, onset, opening move, outset, overture, start
adj
4 beginning, commencing, early, first, inaugural, initial, initiatory, introductory, maiden, primary
Antonyms
1 blockage, cessation, closing, closure, obstruction, occlusion, plug, seal, stoppage
3 close, completion, conclusion, culmination, ending, finale, finish, termination, winding up (informal)