1. The measurement of areas, especially the area of a plane figure or surface.
Usage: technical; mathematics and surveying
2. The use of a planimeter (an instrument) to measure the area of an irregular plane figure.
Usage: technical; surveying and engineering

Examples

• The surveyor used planimetry to calculate the exact area of the irregularly shaped property.
• Planimetry is essential in cartography for determining land areas from maps.
• The engineer applied planimetry techniques to measure the cross-sectional area of the canal.
• Modern software has made planimetry faster and more accurate than manual methods.
• Students learned planimetry as part of their geometry and surveying coursework.