Definition:Transcendental Function/Also defined as

Definition
Some sources define a transcendental function as a real function or complex function which is not an elementary function.

However, the distinction between what is and is not an elementary function is more or less arbitrary, consisting of both algebraic functions and those derived from the exponential function, which itself is not algebraic.

The current school of thought appears to be that this definition: "not an elementary function" is actually considered to be erroneous.