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observation, attention, action of watching / taking notice▼noun
surveillance [surveillances]▼noun[UK: sɜː.ˈveɪ.ləns] [US: sər.ˈveɪ.ləns]
usage [usages]▼noun[UK: ˈjuː.sɪdʒ] [US: ˈjuː.sədʒ]
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