valid

This word carries a sense of authorization and legitimacy. When applied to documents or permits, it suggests a state of active power, meaning the item has not expired and is recognized by an authority. It functions as a green light for a process to proceed legally. In an intellectual or conversational setting, it shifts toward rationality. Calling an argument valid does not necessarily mean it is the only truth, but rather that it is logically sound and deserves respect. It validates the speaker's perspective as being grounded in reality rather than whim.