Adi Shankaracharya, also known as Shankara, is widely regarded as one of the most influential philosophers and theologians in Hinduism. He is credited with reviving the Advaita Vedanta school of thought, which emphasizes the non-dualistic nature of reality and the ultimate oneness of the individual soul with the universal consciousness. In his teachings, Shankara placed a great emphasis on the practice of meditation as a means to achieve spiritual enlightenment and liberation.

Meditation, or dhyana, is an integral part of Shankara's teachings and is considered to be one of the most effective tools for self-realization. According to Shankara, the mind is the root cause of all suffering and ignorance, and through meditation, one can overcome the limitations of the mind and experience the true nature of reality. He believed that the mind is like a mirror, and through meditation, one can polish and purify it to reflect the true image of the self.

Shankara's approach to meditation is deeply rooted in the Upanishadic tradition, which emphasizes the importance of self-inquiry and contemplation. He taught that meditation is not just a physical practice but a state of mind, where one can transcend the limitations of the body and mind and connect with the divine within. Through meditation, one can cultivate a deep sense of inner peace, clarity, and understanding, which are essential for spiritual growth.

Shankara also stressed the importance of a regular and disciplined meditation practice. He believed that a consistent practice of meditation is necessary to still the mind and achieve a state of pure consciousness. He encouraged his followers to meditate at least twice a day, in the morning and evening, for a minimum of one hour each time. This regular practice helps to create a powerful and positive energy within, which can lead to a deeper understanding of the self and the ultimate reality.

In his teachings, Shankara also emphasized the role of a guru or spiritual teacher in guiding the practitioner on the path of meditation. He believed that a guru is essential for providing proper guidance and instruction, as well as for imparting the necessary knowledge and techniques for successful meditation. Shankara himself had many disciples who were initiated into the practice of meditation and went on to become great spiritual leaders.

In conclusion, meditation plays a crucial role in Adi Shankaracharya's teachings. It is seen as a powerful tool for self-realization and liberation from the cycle of birth and death. Through regular and disciplined practice, one can transcend the limitations of the mind and experience the true nature of the self. With the guidance of a guru, one can deepen their practice and ultimately achieve the ultimate goal of Advaita Vedanta – the realization of the oneness of all beings with the universal consciousness.