American Heritage Dictionary
(5)
Century Dictionary
(10)
GNU Webster's 1913
(2)
WordNet
(3)
Elsewhere on the web
One concept that's gotten attention is the "space broom," a ground-based laser that will use quick pulses to singe orbital debris, changing each piece's trajectory so that it deorbits faster.— FOXNews.com
Despite her busy schedule, the globetrotting singe is a responsible mother.— dailyindia.com News Feed
This is the first time since July that McCain has had only a singe-digit lead.— Hominid Views
"_When He was reviled, He reviled not again._" The fire of revenge may singe or even scorch my enemy, but it will do far more damage to the furniture of my own soul.— My Daily Meditation for the Circling Year
177. CHICKEN BROTH Draw, singe, and cut a chicken into four quarters; wash these, put them into a clean saucepan with a quart of water, and set the broth to boil on the fire; skim it well, season with two ounces of sago, a small sprig of thyme and parsley, and a little salt.— A Plain Cookery Book for the Working Classes

American Heritage Dictionary (1)
Century Dictionary (1)
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You can expect to see this word about once a year.