Nostalgia: comes from Greek nostos "homeward journey, return home" and algosnostos originally referring to the journey of Odysseus and the heroes from Troy.
Nostalgia: the word Nostalgia is like a grammar lesson: you find the present tense, but the past perfect!
Nostalgia: describes a longing for the past, often in idealized form. Nostalgia may or may not also be known as homesickness. The exact meaning changed over time and today nostalgia isn't what it used to be.