Definition & Meaning of "polysemy"in English

What is "polysemy"?

Polysemy is the phenomenon where a single word has multiple related meanings. For example, the word "light" can refer to something that is not heavy or to the brightness from a source like the sun or a lamp. Unlike homonyms, where meanings are unrelated, polysemous words have meanings that share a common origin or connection. Polysemy is important in language because it shows how words can develop different uses over time while maintaining a link to their original meaning, adding flexibility and richness to communication.