The act of organizing or positioning elements in a new or different order or structure. It involves changing the existing arrangement without necessarily adding or removing components.
From Middle English 'arrange' via Old French 'arangier' meaning 'to put in a row,' combined with the prefix 're-' indicating repetition. The concept evolved from physical ordering to abstract organizational restructuring in the 17th century.
In chemistry, rearrangement reactions are fascinating because atoms literally dance around to form new molecular structures while keeping the same formula - it's like molecular musical chairs where everyone ends up in a different seat but no one leaves the game!
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