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valid (adj.)

1570s, "having force in law, legally binding," from French valide (16c.), from Latin validus "strong, effective, powerful, active," from valere "be strong" (from PIE root *wal- "to be strong"). The meaning "sufficiently supported by facts or authority, well-grounded" is first recorded 1640s.

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Definitions of valid from WordNet

valid (adj.)
well grounded in logic or truth or having legal force;
a valid argument
a valid contract
a valid inference
valid (adj.)
still legally acceptable;
the license is still valid
From wordnet.princeton.edu