A strong persistent yearning or desire, especially one that cannot be fulfilled.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "longing" in a sentence
"But, though progressives know that, the longing is acute and the temptation to rebind themselves to such impulses strong."
"Among other things, this longing is the unruly, "the surging, billowing sea" (Of Human Freedom 35) and the birth place that Schelling explicitly associates with the Platonic chora, a complex association that I have discussed elsewhere ( "Tropics of Negativity")."
"If "longing" is indeed one of the catch phrases of nostalgia, I wonder if ETA Hoff. and Goethe might fit your bill, too."