What is another word for three years?
Pronunciation: [θɹˈiː jˈi͡əz] (IPA) 
Three years is a significant span of time that can be expressed in a variety of ways using different synonyms. Some common synonyms for the term "three years" are "triennial," "tertiary," "tricennial," and "thrice-yearly." Triennial refers to an event that occurs once every three years. Tertiary implies a third in order, ranking, or importance, whereas tricennial signifies an event that occurs once every 30 years. On the other hand, thrice-yearly suggests something that occurs three times a year. Each of these synonyms highlights the duration of three years, while adding a unique flavor to the meaning, and can be used interchangeably depending on the context.
