1.  validation(n = noun.act) proof, substantiation - the act of validating; finding or testing the truth of something;
is a kind of determination, finding
has particulars: authentication, certification, documentation, support, monetisation, monetization, probate
Derived forms verb validate₂, verb validate₃

2.  validation(n = noun.cognition) establishment - the cognitive process of establishing a valid proof;
is a kind of cogent evidence, proof
Derived forms verb validate₂, verb validate₃

   The act of giving validity. Knowles. [1913 Webster]