Yoga
Yoga means union between the individual self and the infinate consciousness. Meditation is one of the most important practises in the yoga system and is the means by which this merger or union is achieved. So Yoga is a system or science that enables an individual to develop themselves physically, mentally and spiritually, and meditation is the practise that makes the mental and spiritual development possible.
There are eight parts of this practise and since its goal is union (yoga) with the cosmic consciousness, it is also known as Astaunga or eight limbed yoga: Niyama, Yama, Asana, Pranayama, Pratyahara, Dharana, Dhyana and Samadhi.