1) проём, отверстие; щель; зазор; просвет
2) зев (ключа)
3) раскрытие (шва, щёк)
4) калибр (валка)
5) открытие (клапана и т. д.)
6) начало (работ и т. п.)
- opening of bids
- access opening
- beam opening
- booth front opening
- bridge opening
- bridge waterway opening
- discharge opening
- door opening
- effective opening
- exhaust opening
- face opening of exhaust hood
- feed opening
- flare opening
- floor opening
- formal opening
- gate opening
- hood inlet opening
- inlet opening
- intake opening
- jaw opening
- observation opening
- outlet opening
- outside air opening
- spillway opening
- suction opening
- supply air opening
- valve opening
- ventilation opening
- window opening