Definition of 911:
(n) :
The telephone number for emergency services in the United States, Canada, Mexico, Belize, Costa Rica, Argentina, Uruguay, Ecuador, Saudi Arabia, Egypt, Jordan, Liberia, Ethiopia, the Philippines, Anguilla, Palau, and Tonga.
(n) :
(Canada, US, Belize, Liberia, Philippines, metonymic) Emergency services; emergency service personnel.
(n) :
(Canada, US, Belize, Liberia, Philippines, colloquial, metonymic) An emergency phone call.
(n) :
(Canada, US, Belize, Liberia, Philippines, colloquial, metonymic) An emergency.
(v) :
(Canada, US, Belize, Liberia, Philippines, colloquial) To call emergency services.
(n) :
(automotive) A prominent family of sports cars manufactured by Porsche.