C17: from Latin apodīcticus, from Greek apodeiktikos clearly demonstrating, from apodeiknunai to demonstrate
Word Origin and History for apodictic
adj.
"clearly demonstrated," 1650s, from Latin apodicticus, from Greek apodeiktikos, from apodeiktos, verbal adjective of apodeiknynai "to show off, demonstrate," literally "to point away from" (other objects, at one), from apo "off, away" (see apo-) + deiknynai "to show" (see diction).