Meaning of "a certain air of"?

Question

What does "a certain air of" mean? I met it in the Chapter 3 of "A Study in Scarlet" by sir A. C. Doyle:> He was a man with some amount of self-importance and **a certain air of** command.

Answer 1

In this context, this means that the person conducts themselves in a way that gives other people the idea that he is in charge, even if they don't know him personally. It can be used to describe a person's personality. For example, "The doctor had a certain air of superiority, and always made others feel less intelligent." However, it can also be used to describe the feeling associated with a place. For example, "The cemetery had certain air of sadness. Anyone who went there felt an eeriness and dread."