(aviation) A sudden landing of an aircraft, made in case of an on-board emergency or another reason requiring an immediate landing.

(ice hockey) A goaltender who will play for either team in the case that their goalies are unable to play.

plural of emergency department

(healthcare) A department of a hospital where seriously ill or injured patients, often with life-threatening conditions that require urgent or immediate treatment, are brought in, usually by ambulance.

the mathematical concept of matching the sequence of counting words with objects where each object is allocated a number in turn, with the final number word corresponding to the total.

An electric light that turns on to give light during a power outage.

plural of emergency man

(historical) A man provided for any special service, especially in Irish evictions, and in saving the crops and other property of men who were boycotted.

plural of emergency goalie

The dangerous situation in which anthropogenic climate change threatens to cause irreversible environmental damage. / (countable) An official recognition that such a situation exists.