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in the open▼(outdoors)preposition
open-air▼(taking place outdoors)adjective[UK: ˈəʊ.pən eə(r)] [US: ˈoʊ.pən ˈer]
opencast▼(of or pertaining to strip mining)adjective[UK: ˈəʊ.pənk.ɑːst] [US: ˈoʊ.pənkæst]
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