verb · to be present at one's place of residence

我今天一整天都在家。

verb · to be present at one's workplace as opposed to being away on a business trip

刘经理今天不在家，他去外省参加年度行业会议了。

preposition · to remain a layperson in a religious context rather than becoming a monk or nun

他是一位在家修行的佛教徒。