Passing is an interesting word with varying meanings depending on the context. It can mean moving past someone or something, something happening momentarily or temporarily, or even the act of dying. When seeking synonyms for this word, one connotation that comes to mind is "transitory." This suggests that something is not lasting or permanent, but rather fleeting. Other synonyms for passing include "brief," "fleeting," "ephemeral," and "transient." These words all have to do with the short-lived or temporary nature of an event or experience. In contrast, the synonyms "overlapping," "adjacent," or "following" can be used to describe the way one thing succeeds another.