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valid (adj) legally acceptable; (of arguments) sound.
A valid permit is a legally accepted permit and is still in force. A valid ticket for a journey is a proper ticket. A valid argument is a sound argument, that is, a correct argument.
- Though an Indian he could do any job in the US, because he had a valid work permit. The work-permit, being legally acceptable, enabled to take any job in the US.
- The court rejected the lawyer’s argument as not valid. It ruled that his argument was not correct and unacceptable.