MESOMERISM Meaning of MESOMERISM in English [ mɪ'sɒmərɪz(ə)m , mɪ'zɒm- ]■ noun Chemistry old-fashioned term for resonance .Derivativesmesomeric adjective Origin1930s: from meso- after tautomerism . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004