The free emission or passing of air, etc., from some confined space; spec. the emission into the atmosphere of radioactive dust and debris from an…

The action of being discharged through an outlet; venting. Cf. event, v.1

The action, usually on the part of something confined or pent up in a comparatively small space, of escaping, or passing out; means, power, or…

The action of running out; escape from confinement; ‘progression beyond fixed limits’ (Johnson); running to extremes; an instance thereof.

The escaping of water, gases, etc. from confinement; now esp. a leakage of gas, electricity, etc.