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usually uncountable, plural behaviours
Britain standard spelling of behavior. quotations examples
After all, it is undeniable that the B.R. standard coach scored highly in comparative trials with other European railway vehicles on the Continent a few years ago, so that B.R. civil engineers must share responsibility for any defects in its behaviour over here.
1960 December, “Talking of Trains: The riding of B.R. coaches”, in Trains Illustrated, pages 705–706