marathon

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mar·a·thon / ˈmarəˌ[unvoicedth]än/ • n. a long-distance running race, strictly one of 26 miles and 385 yards (42.195 km). ∎  a long-lasting or difficult task or operation of a specified kind: the last leg of an interview marathon that began this summer. ∎  [as adj.] of great duration or distance; very long: marathon workdays.DERIVATIVES: mar·a·thon·er n.

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