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Definition of hot spot
1a small area or region with a relatively hot temperature in comparison to its surroundings. a very hot and dry place where a fire is likely to start, or where a fire has been burning:most of the fires were out Monday, but crews were still watching for hot spots Geology an area of volcanic activity, especially where this is isolated. 2a place of significant activity or danger:a hot spot of commerce they identified eight pollution hotspots at the mouth of the Thames a popular place of entertainment:she knew all the Manhattan hot spots for classy blues and retro jazz 3an area on a computer screen that can be clicked to activate a function. a public place with an available wireless signal for Internet access.