The finishing of a building's roof, often accompanied by a special ceremony.

(nautical) A line used to raise or top the end of a gaff, or of a boom.

present participle of top off

plural of boot-topping

plural of topping lift

(biology) A reproductive behaviour of butterflies and certain other insect species in which individuals congregate on hill tops in order to find partners and mate.

present participle of black-top

present participle of black top

(engineering) The high-temperature power cycle of a combined cycle power plant.

plural of topping cycle