/ ˈvælɪd; NAmE / adjective
1.
that is legally or officially acceptable :
a valid passport
a bus pass valid for 1 month
They have a valid claim to compensation.
2.
based on what is logical or true :
She had valid reasons for not supporting the proposals.
The point you make is perfectly valid.
3.
( computing ) that is accepted by the system :
a valid password
OPP invalid
► val·id·ly adverb :
The contract had been validly drawn up.
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WORD ORIGIN
late 16th cent.: from French valide or Latin validus strong, from valere be strong.