1. In programming, a procedure or subroutine that has been called or referenced but has not been defined or implemented in the code
The program crashed because it tried to execute an undefined procedure.
O programa travou porque tentou executar um procedimento indefinido.
2. A process or method that lacks clear definition, specification, or established guidelines
Following an undefined procedure led to inconsistent results.
Seguir um procedimento indefinido levou a resultados inconsistentes.