in memoriam /ɪn məˈmɔː.ɹi.əm/adverb 1noun 1forms 1 adverb1 •In memory (of); as a memorial.An Enchanted Castle, and Other Poems, 1893, p. 72, prefaces the poem with this line, which suggests that the poem was written “in memoriam”: “[C. L. P., OB. JULY 18, 1884.]”. — 2004 noun1 •An announcement or composition etc. in memory of a deceased person. formsin memoriams