As Canadians struggle whether marriage should be redefined to include unions between homosexuals, the editors of the Canadian Oxford Dictionary have galloped out of the starting gate holding Yes banners. Next year's edition of the dictionary will define marriage as "the legal or religious union of two people," according to editor-in-chief Katherine Barber. . . . there's no doubt the 2004 dictionary will become something of a collector's item should Parliament not end up redefining marriage. Barber should have borrowed from the old newspaper maxim: When in doubt, leave out.