411 REFERENCE · Wiktionary
Little Optimum
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English
Proper noun
? 1 Little Optimum
en Medieval Warm Period
en 1999 2000 Robert Lacey; Danny Danziger The Year 1000: What life was like at the turn of The First Millennium Abacus London 139 Meteorologists describe this medieval warm epoch as the ‘Little Optimum’, and they cite it as the explanation of such phenomena as the Viking explosion into Russia, France, Iceland, and the northwestern Atlantic.