British spelling of 'biasing'; the present participle of bias, showing the act of causing unfair preference.
From 'bias' plus '-ing', with British English preserving the double-s spelling from French origins. American English would write this as 'biasing' with single-s.
British 'biassing' vs American 'biasing' is a classic example of how two versions of English handle the same word differently based on historical spelling conventions!
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