What is the meaning of coupling has multiple meanings depending on context, general meaning refers to joining or connecting two things together. In engineering and plumbing, coupling is fitting that joins two pipes, tubes, or shafts together in straight line to extend length or transfer power, for example pipe coupling connects two pipes, shaft coupling connects two rotating shafts. In railways, coupling connects train cars. In physics, coupling refers to interaction between two systems, such as coupling of oscillators. In electronics, coupling refers to transfer of energy from one circuit to another, such as capacitive coupling. In biology, coupling refers to joining. In relationships and social context, coupling means forming romantic pair or couple, two people joining as partners. In television, Coupling is title of British sitcom about dating and relationships, playing on double meaning of romantic coupling and technical coupling. In chemistry, coupling reaction joins two molecules. So core meaning of coupling is act of joining, linking, or pairing two things together to form connection, whether physical pipes, mechanical shafts, electrical circuits, or romantic partners, emphasizing union of two parts into functioning whole.
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