Definition:Transversal (Geometry)/Alternate Angles

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Alternate angles are interior angles of a transversal which are on opposite sides and different lines.

In the above figure, the pairs of alternate angles with respect to the transversal $EF$ are:

$\angle AHJ$ and $\angle DJH$
$\angle CJH$ and $\angle BHJ$

Also known as

It may be possible to see the alternate angles if a transversal referred to as the alternate interior angles, but the majority of sources take it for granted that the angles in question are interior.

Also see