2. An aid; such as, a word that helps to resolve a situation or a game: The key to solving the crossword puzzle was "siphon".
3. A legend or explanation of markings on a map: Dora checked the key on the street guide so she could determine the distance to the next city.
4. A coral reef off the southern coast of Florida: Have you ever been to the Florida Key?
After studying the key on the map, Bryan traveled to the Florida Key where he located the historic quay.
After Karen's speech, which outlined the key points in the history of the quay, the guide unlocked the gate with her key and the visitors spent the day exploring the quay and admiring the key on the blue sea.
"On her trip to Florida, Susan and her family visited Key West, a small island only four miles long and two miles wide."
"The seaport, also called Key West, is the most southern city in the United States with a population of about 25,200 people."2. Etymology: Spanish cayo, "shoal, rock"; from Arawak.
2. Behavior that deviates from what is considered to be normal or proper: Jan's neighbor had off-key activities which disturbed others who lived near him because he played his recorded music very loudly or had the volume on his TV blasting so much that people could not enjoy listening to their own TVs or were unable to go to sleep while he was continuing his off-key activities.