1. (n.) The attainment of the highest point of altitude reached by a heavenly body; passage across the meridian; transit.

2. (n.) Attainment or arrival at the highest pitch of glory, power, etc.

Z accomplishment acme acme of perfection apex apodosis apogee bitter end brow cap catastrophe ceasing cessation climax close closure cloud nine coda completing completion conclusion consummation crack of doom crest crown culmen curtain curtains death decease denouement destination destiny doom edge effect end end point end result ending envoi epilogue eschatology expiration extreme limit extremity fate final result final solution final twitch final words finale finality finis finish finishing fulfillment full development goal heaven heavens height high noon highest pitch highest point izzard last last act last breath last gasp last things last trumpet last word last words latter end limit maturation maturity maximum meridian mountaintop ne plus ultra no place higher noon omega payoff peak perfection period peroration pink pink of perfection pinnacle pitch point pole quietus realization resolution resting place ridge ripeness rounding off rounding out seventh heaven sky spire stoppage stopping place summit swan song term terminal termination terminus tip tip-top top topping off topping-off ultimate upmost upper extremity uppermost utmost vertex very top windup zenith