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rate constant [rate constants]▼◼◼◼ noun[UK: reɪt ˈkɒn.stənt] [US: ˈreɪt ˈkɑːn.stənt]
rate coefficient [rate coefficients]▼ noun[UK: reɪt ˌkəʊɪ.ˈfɪʃnt] [US: ˈreɪt ˌkoʊɪ.ˈfɪʃnt]