Noun

(similarities)

Closeness of appearance to something else.

(philosophy) The relation of sharing properties.

Hardly is there a similarity detected between two or three facts, than men hasten to extend it to all. — Sir W. Hamilton.

Noun

(en noun)

A longing for home or familiar surroundings; homesickness.

A bittersweet yearning for the things of the past.

*{{quote-magazine, date=2013-08-16, author=(Oliver Burkeman)

, volume=189, issue=10, page=20, magazine=(The Guardian Weekly) , title= This is the cutest article , passage= I can't have been the only person, last week, to feel a rush of nostalgia upon learning that Thames Water had removed a bus-sized, 15-tonne lump of food fat ("mixed with wet wipes") from the sewers under London. The fatberg was an August news story redolent of the old-fashioned silly season.}}

Reminiscence of the speaker's childhood or younger years.