The word "sen" is a term that can have various meanings based on the context. Its usual definition is "one hundred" in Swedish, but it can also refer to a person's name or a souvenir item sold in Japan. Finding synonyms for this word can be a challenging task due to its uniqueness and limited usage. Still, some alternative words that might be close in meaning include "hundredfold," "centenary," or "centennial." These synonyms could be used in different contexts, including math, history, and celebrations. It is always essential to consider the context and ensure that the synonym chosen accurately reflects the intended meaning.