Mean sea level is a term used to describe the average height of the sea level at a particular location over a specific period. There are several synonyms for this terminology that are often used interchangeably. Some common synonyms include Average Sea Level, Normal Sea Level, and Standard Sea Level. Additionally, other similar terms include Mean Tide Level, Chart Datum, and reference level. These synonyms are frequently used in both marine and coastal engineering and climatology, as mean sea level is a crucial component in determining sea level rise and other related phenomena. Regardless of the specific term used, the concept of mean sea level is essential for understanding and predicting the impact of the ocean on the earth's environment.