Meditation 

What is the meaning of meditation in yoga?
Meditation is a part of yoga, which deals with mental relaxation and concentration. Here, attention is focused on thoughts and breath. Being aware of breathing automatically controls the thought process and thus relaxes mind completely.
Loosely, meditation refers to the state of the mind when you are in yoga (in union), and actually means yoga (union).
Texts on râja yoga, which is said to be the ‘yoga of meditation’, say that yoga, and hence meditation, is the state that arises when you ‘still’ the fluctuations of the mind.