'auteciousness' originates from New Latin/Modern English, specifically from the adjective 'autecious' (also spelled 'autoecious'), where Greek 'autos' meant 'self' and Greek 'oikos' meant 'house' or 'dwelling' (used for 'host').

'auteciousness' was formed in English by adding the noun-forming suffix '-ness' to 'autecious', which in turn comes from New Latin (autoecius/autecius) built from Greek 'autos' + 'oikos'; the variant spelling 'autoecious' appears in 19th-century parasitological literature before the modern English formation 'auteciousness' became used.

Initially the Greek-derived elements signified 'self' + 'house/host'; over time the term has come to be used in biology/parasitolgy to mean specifically 'completing the whole life cycle on a single host species'.