/ ˈvælɪdeɪt; NAmE / verb [ vn ] ( formal )
1.
to prove that sth is true :
to validate a theory
OPP invalidate
2.
to make sth legally valid :
to validate a contract
OPP invalidate
3.
to state officially that sth is useful and of an acceptable standard :
Check that their courses have been validated by a reputable organization.
► val·id·ation / ˌvælɪˈdeɪʃn; NAmE / noun [ U , C ]
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WORD ORIGIN
mid 17th cent. (in the sense make legally valid ): from medieval Latin validat- made legally valid, from the verb validare , from Latin validus strong, from valere be strong.