in- (1), im-

in- (1), im- A negation prefix indicating "not" or "against." From Latin in- 'id.' From Proto-Italic *in- 'id.' From Proto-Indo-European *n̥- 'id.' Indo-European Italic Oscan an-, Umbrian a- Celtic Old Irish in-, Old Welsh an-, Old Breton an-, Old Cornish an- Germanic Gothic un-, Old Norse ó-, Old High German un-, Old Saxon un-, Old English un- (English un-) Hellenic Ancient Greek ἀν- (án-) Indo-Iranian Sanskrit an-, Avestan a- Tocharian A an-, B an- de Vaan, M. Etymological Dictionary of Latin and Other Italic Languages. BRILL. 2014. Real Academia Española. Diccionario de la lengua española. Online. 23rd ed. Madrid: Espasa Calpa. 2014. http://www.rae.es/. Sihler, A. New Comparative Grammar of Greek and Latin. Oxford University Press. 2008.