Pronunciation: (ā" po-stēr"ē-ôr'ī, -ōr'ī, -ôr'ē, -ōr'ē),[key] 1. from particular instances to a general principle or law; based upon actual observation or upon experimental data: an a posteriori argument that derives the theory from the evidence. Cf. a priori (def. 1).
2. not existing in the mind prior to or independent of experience. Cf. a priori (def. 2).