What is "by definition?

"By definition" is a phrase that is commonly used to refer to a statement or concept that is inherently true or accurate based on the meaning of the words used. It is often used to provide clarification or establish a baseline understanding of a particular concept or idea. When something is described as being true "by definition," it means that the given characteristics or qualities of that thing are inherent to its very nature or definition. This phrase is often used in discussions or arguments to emphasize the essential nature of a particular concept or to assert that something is true based on its definition.