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WordNet-Online 
 Definitions from WordNet
Noun open-class word has 1 sense 
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| Definitions from the WebOpen-Class WordDefinition: Open-class words, also known as content words, are words in a language that can be modified and added to over time. These words include nouns, verbs, adjectives, and adverbs, and they are open to new additions and changes. Sample Sentences: 
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| opel open-air open-air market open-air marketplace open-air prenominal  open-and-shut open-angle glaucoma open-chain open-class word open-collared open-door policy open-end credit open-end fund open-end investment company open-end wrench open-ended open-enrollment 
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