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A first inventive microwave dielectric composition comprises a ceramic composition represented by AnR4Ti3+nO12+3n, where a is an alkaline earth metal element, R is a rare earth element and characterized in that a case satisfying A=Ba and a case of R=La is excluded and the compositional ratio n=1, 2 or 4. A second inventive microwave dielectric composition comprises a ceramic composition represented by AXR4Ti3+XO12+3X, where A is an alkaline earth metal element, R is a rare earth element and characterized in that the compositional ratio X is within a range of 0.5
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