Definition:Transcendental Function

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A transcendental function is an analytic function which is not an algebraic function.

That is, it cannot be expressed as a polynomial equation.

Defined by Integral

Definition:Transcendental Function/Defined by Integral

Defined by Differential Equation

Definition:Transcendental Function/Defined by Differential Equation

Also defined as

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.

However, the distinction is not considered particularly important nowadays.

As long as it is made clear which definition is being used at the time, that would be adequate.