what is meant by adjacent angles?

Sakshi Hi!

The ans to your question is

When two angle share a common vertex AND a common side they are called adjacent angles

Please Note that Z does not have adjacent angles as the don't share a common vertex. Similarly, verically opposite  angles are

not adjacent angles as the dont share a ​ common side.

Hope it helped!
 

Adjacent angles are two angles that have a common vertex and a common side.
 

Adjacent angles are two angles that have a common vertex and a common side. the vertex of an angle is the endpoint of the rays that form the angle. When we say common vertex and common side, we mean that the vertex point and the side are shared by the two angles.

Angles at. Side to each are adjacent angles