The word transcendental has several meanings, depending on the context. Here are some of the possible definitions:

• Transcendental means beyond or above the range of normal or physical human experience. For example, some people may have transcendental visions or experiences that are not explainable by science or logic¹.
• Transcendental also means relating to a system of philosophy that emphasizes the intuitive and spiritual above the empirical and material. For example, transcendentalism was a movement in 19th-century American literature and thought that advocated individualism, self-reliance, and harmony with nature².
• Transcendental can also mean concerned with the a priori or intuitive basis of knowledge, independent of experience. For example, in the philosophy of Immanuel Kant, transcendental judgments are those that are both synthetic and a priori, meaning that they add new information to our knowledge without relying on empirical evidence³.
• Transcendental can also mean surpassing or superior to others. For example, one might say that Mozart was a transcendental genius in music, or that Einstein was a transcendental figure in physics⁴.
• Transcendental can also mean of or relating to a transcendental number, which is a number that cannot be expressed as the root of any algebraic equation with rational coefficients. For example, pi and e are transcendental numbers.

ソース: Bing との会話 2023/9/19
(1) 英語「transcendental」の意味・読み方・表現 | Weblio英和辞書. https://ejje.weblio.jp/content/transcendental.
(2) transcendentalの意味 – goo辞書 英和和英. https://dictionary.goo.ne.jp/word/en/transcendental/.
(3) TRANSCENDENTAL | English meaning – Cambridge Dictionary. https://dictionary.cambridge.org/dictionary/english/transcendental.
(4) Transcendental Definition & Meaning | Dictionary.com. https://www.dictionary.com/browse/transcendental.