The quality or state of being fuzzy: covered with fuzz, or unclear and imprecise.
Noun formed from fuzzy by adding -ness suffix, from fuzz of uncertain origin possibly related to Low German or Scandinavian words meaning 'to make fluffy.'
In formal logic, the invention of 'fuzzy set theory' by Lotfi Zadeh in 1965 allowed computers to handle real-world uncertainty—it's why AI systems can now work with 'somewhat true' instead of just 'true' or 'false.'
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