Sentence:  The girl stooped to pluck a rose, and as she bent over it, her profile was clearly outlined. She held the flower to her face with a long-drawn inhalation, then went up the steps, crossed the piazza, opened the door without knocking, and entered the house with the <WSD>air</WSD> of one thoroughly at home. 
Meaning of the word marked with <WSD> tags:  A feeling or sense.