The term "mean" has several different meanings depending on its context.
1) In a general sense, it can refer to being unkind or cruel, showing no mercy or compassion towards someone or something. For example, "He's such a mean person who never helps others."
2) It can also be used as an adjective to describe the average value of a set of numbers. In this context, it means calculating the sum of all the numbers and dividing by the total number of values in the dataset. For example, "The mean grade point average for students at this university is 3.5."
3) Finally, "mean" can also refer to something that is typical or ordinary. In this context, it means conforming to a standard expectation. An example would be, "This restaurant has decent food, but nothing special - just your regular fast-food mean."