Why is the ninth month called September?
1510s, from Middle French elegie, from Latin elegia, from Greek elegeia ode "an elegaic song," from elegeia, fem. of elegeios "elegaic," from elegos "poem or song of lament," perhaps from a Phrygian word.
A form of poetry that mourns the loss of someone who has died or something that has deteriorated. A notable example is the “Elegy Written in a Country Churchyard,” by Thomas Gray. (Compare eulogy.)