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  • If there is an idea that can't be tested by experiment, it probably shouldn't be called a 'theory'. That would clear up a lot of confusion. If there is no way to be sure something is true, it can't really be called 'knowledge'. If someone chooses to live by ideas that they can't be sure are true, then that is a 'preference'.
    – Scott Rowe
    Commented May 28 at 10:19
  • @ScottRowe Your comment is largely irrelevant to my answer and to the question since it talks about being sure, which is a state of your mind and has nothing to do with whether an idea is true or not. Your terminological suggestion is inconsistent with standard usage dictionary.cambridge.org/dictionary/learner-english/theory and you have provided no specific explanation for why it should be adopted.
    – alanf
    Commented May 28 at 10:42