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Applicability: noun – relevance of a matter or issue because it is applicable to the subject at hand
‘I can’t see the applicability of your argument to the discussion at hand: I mean, in what way is freedom of speech related to how a woman styles her hair?’
There is also a literary meaning to this word: J.R.R. Tolkien, author of Lord of the Rings is credited with coining the term when asked once too often whether his epic fantasy was an allegory for World War II. He said it wasn’t, but could see how readers might apply such an interpretation to the text without losing anything.