👉 In mathematics, "transcendental" refers to a number that is not algebraic (i.e., it cannot be expressed as a simple fraction of two or more complex numbers) but rather involves irrationality. This means that its decimal expansion either does not terminate or has an infinite number of digits after the decimal point. For example, e, the base of natural logarithms, and π, the ratio of a circle's circumference to its diameter, are examples of transcendental numbers.