ICENI Meaning of ICENI in English I ‧ ce ‧ ni, the /aɪˈsiːnaɪ, -ni/ BrE AmE [P] an ancient British tribe of eastern England who fought against the Romans under the command of their queen ↑ Boudicca Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012