What's the difference between duumviral and duumvirate?

Duumviral

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Definition:

• (a.) Of or belonging to the duumviri or the duumvirate.

Example Sentences:

• (1) The pugnacious Luzhkov, who ran Moscow from 1992, was dismissed after apparently growing too powerful and falling out with Russia's ruling Putin-Medvedev duumvirate.
• (2) Some believe the attacks on Luzhkov reflect increasing tensions within Russia's ruling Putin-Medvedev duumvirate, ahead of presidential elections in 2012.

Duumvirate

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Definition:

• (n.) The union of two men in the same office; or the office, dignity, or government of two men thus associated, as in ancient Rome.

Example Sentences:

• (1) The pugnacious Luzhkov, who ran Moscow from 1992, was dismissed after apparently growing too powerful and falling out with Russia's ruling Putin-Medvedev duumvirate.
• (2) Some believe the attacks on Luzhkov reflect increasing tensions within Russia's ruling Putin-Medvedev duumvirate, ahead of presidential elections in 2012.