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Definition of Monogon
1. Noun. (geometry) A one-dimensional object comprising one vertex and one (not necessarily straight) edge both of whose ends are that vertex. ¹
2. Noun. (geometry) A two-dimensional object comprising one vertex, one edge both of whose ends are that vertex, and one face filling in the hollow formed by that edge. ¹
3. Noun. (optics) A single-faceted reflector. ¹
¹ Source: wiktionary.com