| diadem | (noun) an ornamental jeweled headdress signifying sovereignty | Synonyms: crown |
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| ibidem | (adverb) in the same place (used when citing a reference) | Synonyms: ib., ibid. |
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| modem | (noun) (from a combination of MOdulate and DEModulate) electronic equipment consisting of a device used to connect computers by a telephone line | - |
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| tandem | (noun) a bicycle with two sets of pedals and two seats | Synonyms: bicycle-built-for-two, tandem bicycle |
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| (noun) an arrangement of two or more objects or persons one behind another | - |
| (adverb) one behind the other | Synonyms: in tandem |