Meditation plays a significant role in Tendai, a Japanese Tiantai Buddhist school founded by the monk Saicho in the 9th century. In Tendai, meditation is seen as a means to achieve enlightenment and to deepen one's understanding of Buddhist teachings.

One of the key teachings in Tendai is the concept of "original enlightenment," which states that all beings are inherently enlightened and possess the potential to awaken to their true nature. However, this enlightenment is often obscured by our delusions and attachments. Through meditation, practitioners are able to quiet their minds and gain insight into their true nature, ultimately leading to the realization of their original enlightenment.

Tendai meditation practices are heavily influenced by the Tiantai school of China, which emphasizes the use of concentration and insight meditation. Concentration meditation involves focusing the mind on a single object, such as the breath or a mantra, in order to develop a calm and focused state of mind. This is believed to be a necessary foundation for the practice of insight meditation.

Insight meditation, also known as vipassana, involves observing the nature of reality and gaining insight into the true nature of existence. In Tendai, this is often done through the contemplation of impermanence, suffering, and non-self, which are considered to be the three marks of existence in Buddhism. Through this practice, practitioners are able to see through the illusions of the ego and gain a deeper understanding of the true nature of reality.

Another important aspect of Tendai meditation is the use of visualization and ritual. In Tendai, practitioners may visualize themselves as a deity or a Buddha in order to cultivate qualities such as compassion and wisdom. This practice is known as deity yoga and is believed to help practitioners connect with their innate Buddha nature.

In addition to individual meditation practices, Tendai also places a strong emphasis on group meditation and retreats. These group practices allow for a deeper sense of community and support, as well as the opportunity to learn from experienced teachers.

Overall, meditation in Tendai serves as a powerful tool for self-discovery and spiritual growth. It allows practitioners to cultivate a calm and focused mind, gain insight into the true nature of reality, and ultimately realize their inherent enlightenment. Through regular meditation practice, Tendai practitioners are able to deepen their understanding of Buddhist teachings and bring about positive transformation in their lives.