1A plane figure with five straight sides and five angles.
More example sentences
- In the second case, if the convex polygon is a pentagon incorporating all five points, then any four of these points can be connected to form a quadrilateral.
- This says that the most stable arrangement is a pentagon surrounded by five hexagons.
- The hexagons, pentagons, and triangles that make up the biomes all have their own unique specification due to the irregular nature of the site.
late 16th century: via Latin from Greek pentagōnon, neuter (used as a noun) of pentagōnos 'five-angled'.
Definition of pentagon in:
- The British & World English dictionary