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1. strictly, a complex of two or more complete molecules in which each preserves its fundamental structure and no covalent bonds are made or broken (for example, hydrates of salts, adducts);
2. loosely, association of acids with basic organic compounds (for example, amines with HCl);
3. more loosely, addition of two molecules without the loss of any atom but resulting in formation of new covalent bonds (for example, CH2=CH2 + Br2 → BrCH2-CH2Br).
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