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The Clue
Theses (8 letter answer)
The Answer
THEORIES
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Notes
The answer THEORIES is so rare that it appears less than once every 2500 puzzles.
Definition
THEORY as a noun:
1. a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena; "theories can incorporate facts and laws and tested hypotheses"; "true in fact and theory"
2. (hypothesis, possibility, theory) = a tentative theory about the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena; "a scientific hypothesis that survives experimental testing becomes a scientific theory"; "he proposed a fresh theory of alkalis that later was accepted in chemical practices"
3. a belief that can guide behavior; "the architect has a theory that more is less"; "they killed him on the theory that dead men tell no tales"