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free of charge▼(not requiring any payment - adjective)adjective[UK: friː əv tʃɑːdʒ] [US: ˈfriː əv ˈtʃɑːrdʒ]
voluntary▼(working or done without payment)adjective[UK: ˈvɒ.lən.tri] [US: ˈvɑː.lən.te.ri]
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