“Uranian Love” etymology is from a German use of the term
No it’s not
Which is right?
Your thread title says “definition” but your question seems to be about etymology.
Anyway, the cited passages don’t contradict each other. The first cite says that “Uranian” in the context of “Uranian love” is an Anglicization of a term coined by K.-H. Ulrichs.
The second cite says that “Uranian” in the context of “Uranian poetry” derives from classical sources independently of Ulrichs’ usage but later became linked to it.