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The dfn tag (definition) is used to provide a definition for words you use that may not be familiar to your audience.
By adding a title attribute and value to the dfn tag, a tool tip will pop up with your definition enclosed.
Here's an example of usage:
I used badigeon to repair the masonary.
Rest your cursor on the word "badigeon" in the previous paragraph to see this tag in action.
Here's how that was coded: