閉へい合ごうMeanings1nounclosure; closingTechnical term for the act or state of closing, often used in engineering, mechanics, or formal contexts.バルブの閉へい合ごうを確かく認にんしてください。Please check the closure of the valve.回かい路ろの閉へい合ごうにより電でん流りゅうが流ながれ始はじめる。Current begins to flow upon closure of the circuit.