This is the 10376th most frequent Portuguese word.
excessão
"Excessão" is a misspelling. The correct word is "exceção," meaning "exception" in English.
In this sentence, the word "exceção" (exception) is used to indicate a situation that deviates from the norm or rule.
Ele não costuma aceitar reclamações, mas fez uma exceção desta vez.
He usually doesn't accept complaints, but he made an exception this time.
Here, "exceção" signifies that no exclusions or deviations are allowed from the established rules.
Todos devem seguir as regras, sem exceção.
Everyone must follow the rules, without exception.
The word "exceção" in this context refers to a special case or instance that is an exclusion to the rule mentioned.