1.Proper nounThe 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. .mw-parser-output .defdate{font-size:smaller}
"When you call 911 in the United States, a local dispatcher usually answers the phone with "911" or "911. What's your emergency?"; After witnessing what was possibly a robbery, she called 911."
2.NounEmergency services; emergency service personnel.
"911 is sending an ambulance."
3.NounAn emergency phone call.
4.NounAn emergency.
5.VerbTo call emergency services.
6.Proper nounA prominent family of sports cars manufactured by Porsche.