Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: French
Origin: valide, from Latin validus 'strong, effective', from valere; VALOR

valid

 adjective
     
Related topics: Computers
val‧id
1 a valid ticket, document, or agreement is legally or officially acceptable [≠ invalid]:
a valid credit card
Your return ticket is valid for three months.
2

valid reason/argument/criticism etc

a reason, argument etc that is based on what is reasonable or sensible:
Police officers must have a valid reason for stopping motorists.
3TD a valid password, ID etc is one that will be accepted by a computer system [≠  invalid]
—validity noun [uncountable]
I would question the validity of that statement.
Definition from the Longman Dictionary of Contemporary English
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