维基百科：

Common sense is defined by Merriam-Webster as, "sound and prudent judgment based on a simple perception of the situation or facts." Thus, "common sense" (in this view) equates to the knowledge and experience which most people already have, or which the person using the term believes that they do or should have. The Cambridge Dictionary defines it as, "the basic level of practical knowledge and judgment that we all need to help us live in a reasonable and safe way".

Whichever definition is used, identifying particular items of knowledge as "common sense" is difficult. Philosophers may choose to avoid using the phrase when using precise language. But common sense remains a perennial topic in epistemology and many philosophers make wide use of the concept or at least refer to it. Some related concepts include intuitions, pre-theoretic belief, ordinary language, the frame problem, foundational beliefs, good sense, endoxa, axioms, wisdom, folk wisdom, folklore and public opinion.

Common-sense ideas tend to relate to events within human experience (such as good will), and thus appear commensurate with human scale. Humans lack any common-sense intuition of, for example, the behavior of the universe at subatomic distances [see Quantum mechanics], or of speeds approaching that of light [see Special relativity]. Often ideas that may be considered to be true by common sense are in fact false.

常识（中文）有两个意思，一是英语“Common Sense”的翻译，指与生俱来、无须特别学习而得的思维能力、判断力，或是众人接受、无须解释或论证的意见观念，也即“寻常见识”；另一意思是指普通社会上一个智力正常的人应有的知识，也即“平常知识”。以中英翻译而言，作“平常知识”解的中文词“常识”，其英文对应说法却不是“common sense”，而应是包含或涉及“knowledge”的某个英文词语。