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mass [masses]▼(physics: quantity of matter which a body contains)noun[UK: mæs] [US: ˈmæs]
atomic weight [atomic weights]▼(former terms for relative atomic mass)noun[UK: ə.ˈtɒ.mɪk weɪt] [US: ə.ˈtɑː.mɪk ˈweɪt]
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