What is described as a short statement of principle, for example, "less is more"?

The correct answer is an aphorism, which is defined as a concise statement that expresses a general truth or principle. The phrase "less is more" serves as a clear example of an aphorism because it conveys wisdom in a succinct manner, encapsulating the idea that simplicity can lead to greater effectiveness or beauty. Aphorisms often draw on common experiences or observations, making their messages easily accessible and memorable.

In contrast, a paradox refers to a statement that seems contradictory yet reveals a deeper truth, which can often create a sense of irony or surprise. Antithesis involves contrasting ideas presented in a balanced way within a sentence or phrase, emphasizing differences rather than providing a principal statement. Ellipsis, on the other hand, pertains to the omission of words in a sentence, which can lead to ambiguity or completeness based on context, thus not aligning with the notion of a well-defined principle. These distinctions highlight why "aphorism" is the most fitting option in describing a short statement of principle.