Archetypal means being the original pattern that everything else follows. The definitive version of a type.
It is used to mean both the first example and the most typical one, which is a slight muddle the word has never resolved. So describing somebody as the archetypal English eccentric means they are the purest example rather than the earliest. Psychology gave it particular weight, since Jung used archetype for the basic figures he thought recurred across all human storytelling. The noun archetype is commoner than the adjective.
1adjectivearchetypalBeing the original or most typical example of a kind.
“He is the archetypal village doctor.”
Proto-Indo-European
*h₂ergʰ- — to begin; to command, rule
Ancient Greek
ἀρχέτυπον — model, pattern
Latin
archetypum — original
Old French
architipe
English
archetype
English, today
archetypal
Built from
From archetype + -al. archetype comes from Old French architipe (modern French archétype), from Latin archetypum (“original”), from Ancient Greek ἀρχέτυπον (“model, pattern”), the neuter form of ἀρχέτυπος (“first-moulded”), from ἀρχή (“beginning, origin”) (from ἄρχω (“to begin; to lead, rule”), from Proto-Indo-European h₂ergʰ- (“to begin; to command, rule”)) + τῠ́πος (“blow, pressing; sort, type”) (from τύπτω (“to beat, strike”), from Proto-Indo-European (s)tewp- (“to push; to stick”)).
Etymology from Wiktionary, CC BY-SA