1811, from Fr. polariser, coined by Fr. physicist Étienne-Louis Malus (1775-1812) as a term in optics. Transf. sense of "to accentuate a division in a group or system" is first recorded 1949 in Arthur Koestler.
Main Entry: po·lar·ize Variant: also Britishpo·lar·ise/'pO-l&-"rIz/ Function: verb Inflected Forms: -izedalso British-ised; -iz·ingalso British-is·ing transitive senses 1: to cause (as light waves) to vibrate in adefinite pattern 2: to give physical polarity to polarizeintransitive senses : to become polarized