bias: [16] English acquired bias from Old French biais, but its previous history is uncertain. It probably came via Old Provençal, but where from? Speculations include Latin bifacem ‘looking two ways’, from bi- ‘two’ and faciēs ‘face’, and Greek epikársios ‘oblique’. When the word first entered English it meant simply ‘oblique line’, but by the end of the 16th century it was being applied more specifically to the game of bowls, in the sense of the ‘bowl’s curved path’, and also the ‘unequal weighting given to the bowl in order to achieve such a path’.
The modern figurative senses ‘inclination’ and ‘prejudice’ derive from this.
