Other sources seem to offer no explanation of the term's use either.

No two sources seem to be saying the same thing.

A supply or source of something Both definitions seem to fit.

Its main source of water at the time seems to have been the Rye.

Even with his new source of strength there seemed little he could do.

But its only source seemed to be the empty lock hole in the door!

Yet, most sources seem to admit that more usually a line would form into a solid front.

For consumers, the new sources of miles seem to offer many benefits.

However, contemporary sources do not seem to use the name.

And yet, when all your sources seem to say the same things, you do begin to take them at their word.