HTML dfn tag

The HTML <dfn> tag represents the defining instance of a term.

The defining instance is the instance where the term is being described or defined. This is typically when the term is being used for the first time. There is no need to use the <dfn> each time you refer to the term. You only need to use it at the point that the term is being defined.

<p>We were determined to find a kiwi. A <dfn>kiwi</dfn> is a native bird of New Zealand. </p>
<p>... later in the document...</p>
<p>After walking for 3 days and 3 nights, we finally had a glimpse of a kiwi!</p>

Eg. :

We were determined to find a kiwi. A kiwi is a native bird of New Zealand.

… later in the document…

After walking for 3 days and 3 nights, we finally had a glimpse of a kiwi!