English Noun fanin (countable and uncountable, plural fanins) (computing, electronics) The degree to which a component has separate inputs entering it. Related terms fanout Finnish Noun fanin genitive singular of fan genitive singular of fani Anagrams Fanni Gothic Romanization fanin Romanization of 𐍆𐌰𐌽𐌹𐌽Wikiwand - on Seamless Wikipedia browsing. On steroids.