word-forming element meaning "outside; beyond the scope of; in addition to what is usual or expected," in classical Latin recorded only in extraordinarius, but more used in Medieval Latin and modern formations; it represents Latin extra (adv.) "on the outside, without, except," the old fem. ablative singular of exterus "outward, outside," comparative of ex "out of" (see ex-).
late 14c., "of or pertaining to a judge; pertaining to the administration of justice," from Latin iudicalis "of or belonging to a court of justice," from iudicium "judgment, decision of a court of justice," also the court itself, from iudex "a judge," a compound of ius "right, law" (see just (adj.)) + root of dicere "to say" (from PIE root *deik- "to show," also "pronounce solemnly"). Related: Judicially.
<a href="https://www.etymonline.com/word/extrajudicial">Etymology of extrajudicial by etymonline</a>
Harper, D. (n.d.). Etymology of extrajudicial. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/extrajudicial