Verb in the infinitive with the personal pronoun of first person exercising direct object and enclitic form coming from the Latin comparative certior certius ( accusative certiorem ) of certus certa certum which means true, insurance. Make sure the verb means to be sure of the truth of something, check myself that something is surely true. The philosophers considered that the criterion of truth of the rational Sciences, which ensures the truth of his claims, there is evidence; in the field of experimental sciences, the criterion is the empirical verification. In the normal life of the people we ensure through sensitive experience: we see him, we hear it, we play it...
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