theosis UK /θiːˈəʊ.sɪs/US /θiˈoʊ.sɪs/ noun2 •The likeness to or union with God; deification.For him, theosis or deification was the destination for human salvation, whose attainment Adam’s sin in Eden had imperilled but not rendered impossible;[…] — 2009 •The process of attaining this state of union with God.