Definition of "in memoriam"

An Enchanted Castle, and Other Poems, 1893, p. 72, prefaces the poem with this line, which suggests that the poem was written “in memoriam”: “”.

2004, John P. Frayne and Madeleine Marchaterre, “Notes” to The Collected Works of W. B. Yeats, Volume IX: Early Articles and Reviews, Scribner, page 553

The book can be divided into three main parts: chapters 1, 14 were written in memoriam; in the second part (chapters 2–7) Miller carries out a philosophical investigation of critical rationalism; the third part (chapters 8–13) […]

2009, Zuzana Parusniková, review of David Miller’s Out of Error, in Zuzana Parusniková and Robert S. Cohen (editors), Rethinking Popper, Springer, page 417