An essay can repeat a word such as community, access or success while quietly changing what it means. The sentences may sound coherent even as the argument moves between different claims.
Choose the term doing the most work in your draft. Write a temporary definition in the margin using ordinary language. Then identify one example that fits and one that does not. This is a working boundary for the essay, not a claim that the word has only one valid meaning.
Suppose you use accessible to mean that a public document can be understood without specialist training. Later, you use the same word to mean that the file can be downloaded. Those are related concerns, but evidence for one does not automatically establish the other.
Read every occurrence of the term in sequence. Add a short note when its meaning changes. You may need a more specific phrase, an explicit transition or a narrower central claim.
Do not turn the opening into a dictionary entry unless that serves the reader. A concrete sentence can establish the boundary: “Here, access means being able to obtain and open the document; understanding its technical content is a separate question.”
After revision, check the conclusion. It should not quietly claim a broader kind of success than the body demonstrated. A stable key term makes an essay easier to disagree with productively because readers can identify the actual proposition rather than chasing a moving definition.
Editorial illustration from the site library.