By definition is a phrase commonly used to explain the essence or meaning of a concept or term. However, there are alternative phrases that can be used in place of this common expression. For example, "by its very nature" can effectively capture the same essence as "by definition." Similarly, "inherently" and "intrinsically" can be used when explaining the inherent qualities of an object or idea. Another alternative phrase is "per se," which means "by itself" in Latin. Ultimately, the use of synonyms for "by definition" can add variety and depth to written and spoken language.