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a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.|an idea or plan put forward for consideration.|a feeling of uncertainty or lack of conviction.|desire or be curious to know something; feel doubt.|belonging to the very distant past and no longer in existence; an old person.|form a theory or conjecture about a subject without firm evidence.|the process by which a society or place reaches an advanced stage of social and cultural development and organization.|not able to be relied on; not known or definite.|facts, information, and skills acquired by a person through experience or education; the theoretical or practical understanding of a subject.|a thing that may happen or be the case; the state or fact of being likely or possible; likelihood.