This technique relates to the following sections of the guidelines:

Provide a mechanism for finding or identifying the definitions of words.

A definition list can be used to present the definitions of words. The list is marked up using the dl element. The title-attribute can be used to provide additional information about the definition list. Within the list, each term is put in a separate dt element, and its definition goes in the dd element directly following it.

Definition lists are easiest to use when the definitions are put in alphabetical order.

Example:

This is an example of a list of definitions of nautical terms used on a website about sailing.

 <dl title="Nautical terms">
	<dt>Knot</dt>
	<dd>
		<p>A <em>knot</em> is a unit of speed equaling 1
			nautical mile per hour (1.15 miles per hour 
			or 1.852 kilometers per hour).
		</p>
	</dd>
	<dt>Port</dt>
	<dd>
		<p><em>Port</em> is the nautical term (used on 
			boats and ships) that refers to the left 
			side of a ship, as perceived by a person 
			facing towards the bow (the front of the 
			vessel). 
		</p>
	</dd>
	<dt>Starboard</dt>
	<dd>
		<p><em>Starboard</em> is the nautical term (used 
			on boats and ships) that refers to the right 
			side of a vessel, as perceived by a person 
			facing towards the bow (the front of the 
			vessel).
		</p>
	</dd>
</dl>