Relevant means something or someone remains current and updated about a pertinent topic or issue. It is to be germane in all ramifications.
"The decision to change our plan at any time remains relevant to our cause."
Revelant is an inappropriate spelling of the original word, relevant. It is an unacceptable version that is to be disregarded and labelled as incorrect.
Revelant is not a word in English.
It is a common misspelling of relevant, which means useful or appropriate to an action or idea.
“The students could write their paper on any topic that was relevant to the content of the class.”