well grounded in logic or truth or having legal force
"a valid inference"
"a valid argument"
"a valid contract"
Well grounded or justifiable, pertinent.
"Your concern about the budget cuts is valid since we have already exceeded our spending limit for the quarter."
In plain English: Valid means something is true, correct, or officially accepted as real.
"The coupon was no longer valid after midnight."
Usage: Use valid to describe arguments, reasons, or documents that are logically sound and legally acceptable. It is often confused with valuable, but while something can be worth money without being logical, a claim must have solid justification to be considered valid.
The word "valid" entered English via Middle French, where it originally meant "healthy" or "in good order." It ultimately traces back to the Latin root for being strong and healthy.