1. originally, poetry designed to be sung to the lyre, hence, still today poetry whose sound is attuned to the meaning of the words;
2. in addition, poetry which expresses a personal sentiment or idea of the writer, as opposed to didactic, narrative, dramatic, or philosophical verse.
Given the impossibility of absolute distinctions among such vague concepts, the editors are aware that their choice of "lyric" material may appear arbitrary to alert readers.
French Lyric Poetry: An Anthology, by Frank S. Giese and Warren F. Wilder, The Odyssey Press, Inc. Copyright 1965