Longman Dictionary of Contemporary English
Wiktionary
n. (context firefighting US English) An organization, often part of a local government whose purpose is preventing and putting out fires. May provide other emergency services as well.
WordNet
n. the department of local government responsible for preventing and extinguishing fires
Wikipedia
A fire department ( United States and Canada) or fire brigade ( United Kingdom and Commonwealth) (also known as a fire and rescue service or simply fire service) is a public or private organization that provides predominantly emergency firefighting and rescue services for a specific geographic area, which is typically a municipality, county, or fire protection district. In the United States a fire brigade is the private firefighting organization of a company or enterprise, operated under rules from OSHA. A fire department usually contains one or more fire stations within its boundaries, and may be staffed by career firefighters, volunteer firefighters, or a combination thereof (referred to as a combination department).
A fire department may also provide " fire protection" or fire prevention services, whereby firefighters visit homes and give fire safety advice and fit smoke alarms for members of the public. In many countries fire protection or prevention is seen as an important role for the fire service, as preventing a fire from occurring in the first place can save lives and property.
Usage examples of "fire department".
What if it was someone else, someone who found out about the fire game and knows that the fire department is investigating?
Thank God the San Francisco Fire Department is one of the finest in the nation.
The closest he had ever been to a military organization before that was the Grantville Volunteer Fire Department.
Next door was the fire department and next door to that was the police station.
I knew that one of them had to have already called the police and the fire department, and I honked my horn, pointing toward the road, and Philipe nodded.
The blaze was so intense that the fire department could only let the flames burn out, concentrating on keeping them contained.