1620s, "a leading away," from Latin abductionem (nominative abductio) "a forcible carrying off, ravishing, robbing," noun of action from past-participle stem of abducere "to lead away, take away, arrest" (often by force), from ab "off, away from" (see ab-) + ducere "to lead" (from PIE root *deuk- "to lead"). As "criminal act of forcibly taking (someone)" by 1768; before that the word also was a term in surgery and logic. In the Mercian hymns, Latin abductione is glossed by Old English wiðlaednisse.
"primer, alphabet table," mid-15c., from Medieval Latin abecedarium "an ABC book," neuter of adjective abecedarius, used as a noun, from the first four letters of the Latin alphabet. Abecedarian (adj.) is attested from 1660s.