noun
- a line on a map or chart connecting points of equal value for a particular variable, such as temperature, pressure, or elevation
Usage: technical; cartography and meteorology
Examples
- The weather map displayed isolines showing areas of equal atmospheric pressure.
- Isolines on topographic maps help hikers understand the steepness of terrain.
- Temperature isolines on the forecast chart indicated a cold front moving eastward.
- Cartographers use isolines to represent elevation changes across a landscape.
- The isoline pattern revealed a high-pressure system developing over the region.