Meditation, or zazen, plays a central role in Tiantai Buddhism. It is considered an essential practice for achieving enlightenment and understanding the teachings of the Lotus Sutra. In fact, Tiantai is often referred to as the "Meditation School" due to its emphasis on the practice of meditation.

At its core, Tiantai teaches that all beings possess the potential for enlightenment, and meditation is seen as a means to awaken this potential. Through the practice of meditation, one can attain a state of calmness and clarity, and ultimately gain insight into the true nature of reality.

In Tiantai, there are various forms of meditation, including seated meditation, walking meditation, and visualization meditation. The most commonly practiced form is seated meditation, where one sits in a cross-legged position and focuses on their breath or a specific object. This practice helps to calm the mind and cultivate concentration.

One of the key teachings in Tiantai is the concept of the "three thousand realms in a single moment of thought." This refers to the idea that all phenomena, including our thoughts and emotions, arise and cease in a single moment. Through meditation, one can observe this constant arising and ceasing, leading to a deeper understanding of the impermanent nature of reality.

Another important aspect of Tiantai meditation is the use of mantras, or sacred chants. These mantras are believed to have the power to transform one's consciousness and bring about a state of awakening. The most commonly used mantra in Tiantai is the Lotus Sutra's title, "Nam Myoho Renge Kyo," which is chanted repeatedly during meditation.

Moreover, Tiantai meditation also involves the practice of "samadhi," which is a state of deep concentration and absorption. Through samadhi, one can transcend their ordinary consciousness and gain a direct experience of the ultimate truth.

In addition to its role in individual spiritual practice, meditation also plays a significant role in the Tiantai tradition as a whole. It is seen as a means to deepen one's understanding of the Lotus Sutra and to integrate its teachings into daily life.

In conclusion, meditation is a fundamental aspect of Tiantai Buddhism, serving as a powerful tool for achieving enlightenment and understanding the Lotus Sutra's teachings. Through regular practice, one can cultivate a calm and clear mind, gain insight into the true nature of reality, and ultimately attain liberation from suffering.