"Left wing: those supporting progressive reform and greater welfare of common man.
Right wing: those supporting conservative positions, established order, and traditional values."
--Word Menu, Random House (1992).
"The Old English word for 'left' was winestra. Entymologically this meant 'friendlier' (it is related to Swedish van 'friend')...An ancestor of 'left' existed in Old English -- left or *lyft. But it meant 'weak' or 'foolish'.
Right goes back ultimately to the Indo-European base *reg- 'move in a straight line,' hence 'direct', hence 'rule', which also produced English rich and Latin rex 'king'. The use of the word as the opposite of left...derives from the notion that the right hand is the 'correct' hand to use....in combination with the past participal suffix *-to- resulted in Latin rectus 'straight, right,' which lies behind English rectify, rectum, etc., and prehistoric German *rekhtaz, which has evolved into German and Dutch recht, Swedish ratt, Danish ret, and English right."
--Dictionary of Word Origins, Arcade (1990).