It would be helpful to have an example of what you mean here. As post 2 noted, words can have different meanings depending on the "context" in which they are used.
But ideas themselves can also have different meanings depending on what is going on in the story or essay in which they are presented. For example, when we encounter the phrase "making love" we usuallly think of the specific physical act. However, a few decades ago, the phrase "making love" did not refer to a physical act so much as the words that a man might use toward a woman to convince her that she means something important to him romantically.
In this way, the meaning of the term "making love" depends on the time period in which it is used, and what is going on between the man and the woman at the time.