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In page Nynorsk:

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The word Nynorsk also has another meaning. In addition to being the name of the present, official written language standard, Nynorsk can also refer to the Norwegian language in use after Old Norwegian, 11th to 14th centuries, and Middle Norwegian, 1350 to about 1550.[3] The written Norwegian that was used until the period of Danish rule (1536-1814), closely resembles Nynorsk (New Norwegian). A major source of old written material is Diplomatarium Norvegicum in 22 printed volumes.