Definition of "somewhen"

Out of the drift of facts, whereby you learn / What some was, somewhere, somewhen, somewhy?

1864, Robert Browning, “Mr. Sludge, "The Medium"”, in Wikisource, line 505‎, retrieved 2012-01-18

Yes, though nobody else should reproach me if we should stay together, yet somewhen, years hence, ...

1891, Thomas Hardy, chapter XXXVI, in Tess of the d'Urbervilles - A Pure Woman‎ (Fiction)

An event is a particular thing that happens somewhere and somewhen.

2002, Marc Lange, “What Is Spatiotemporal Locality?”, in An Introduction to the Philosophy of Physics: Locality, Fields, Energy, and Mass‎ (Science / Philosophy), Wiley-Blackwell, page 4

… things always exist or occur somewhen as well. They exist or occur whenever — at whatever times-when — they in fact exist or occur, and not somewhen else.

2008, Michael F. Wagner, “Chapter One”, in The Enigmatic Reality of Time‎ (Science / Physics), Brill, page 26

Somewhen, curling through the intricacies of tau, John/Johan still lived. Somewhen on this very planet he lived, …

2009, Marta Randall, “Secret Rider”, in Robert Silverberg, editor, Trips in Time: Time Travel Tales (Collection of Short Stories)‎ (SciFi), Wildside Press, page 120