nostalgia

n.	1.	(Med.) Homesickness; esp., a severe and sometimes fatal form of melancholia, due to homesickness.
	2.	A sentimental yearning to return to an earlier time remembered as happier or more pleasant, or a former place evoking happy memories; a longing to experience again a former happy time; as, a nostalgia for the brotherhood of the Woodstock music festival; a nostalgia for the comradeship of one's college friends.

Noun

1.

nostalgia - longing for something past

Heimweh, aching, bathos, bleeding heart, cloyingness, daydream, daydreaming, desiderium, goo, hankering, hearts-and-flowers, homesickness, honing, languishing, languishment, longing, mal du pays, maladie du pays, maudlinness, mawkishness, mush, mushiness, namby-pamby, namby-pambyism, namby-pambyness, nostomania, oversentimentalism, oversentimentality, pining, romanticism, sentiment, sentimentalism, sentimentality, slop, sloppiness, slush, soap opera, sob story, sweetness and light, tearjerker, wishful thinking, wishfulness, wistful eye, wistfulness, yearnfulness, yearning, yen