Thermionic emission is one of the widely-used terms in electronics and electrical engineering. It refers to the process of electrons being emitted from a heated surface, typically a cathode. However, there are a number of synonyms or alternate terms for thermionic emission that are commonly used. These synonyms include: electron emission, Edison effect, Richardson effect, and thermionic current. Each of these terms refers to the same physical process of electrons being released from a heated surface, but they may be used in different contexts or by different groups of professionals in the field. Understanding the various synonyms for thermionic emission can help to facilitate clear communication and understanding in technical discussions.