Definition: A theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experimentation. In a general sense, it can also refer to an idea or set of ideas that is intended to explain something, especially one based on general principles independent of the thing to be explained.
Etymology and Origin: The word ‘theory’ comes from the Greek word ‘theoria’, which means ‘a looking at, viewing; a sight, show, spectacle; a contemplation, speculation, a looking at things theoretical’. It entered English in the 16th century and originally meant a concept or mental impression. Over time, its meaning evolved to its current use in science and other disciplines.
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