ibidem ibi·dem UK/ˈɪb.ɪ.dɛm/ US/ˈɪb.ɪ.dem/ uncommon adverb 1. in the same place (used when citing a reference) Synonymsibid.ib. WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.