What does coupling mean is act of joining or linking two things together to form connection or pair. In engineering and plumbing, coupling is fitting that joins two pipes, shafts, or tubes together in straight line to extend length or transfer motion, such as pipe coupling connecting water pipes, or shaft coupling connecting motor to pump. In railway, coupling connects train cars. In electronics, coupling is transfer of energy between circuits, such as capacitive coupling. In physics, coupling describes interaction between two systems like coupled pendulums. In biology and chemistry, coupling reaction joins two molecules. In everyday language, coupling often refers to romantic pairing, two people forming couple, dating or joining as partners. In British TV, Coupling is title of sitcom about six friends navigating romantic couplings. So core definition of coupling is joining two separate entities together to work as unit, whether physical objects like pipes, mechanical components, electrical signals, or people in relationship, emphasizing connection, linkage, and pairing. It is noun form of verb to couple, meaning to join together.
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