American Heritage Dictionary
(4)
Century Dictionary
(1)
GNU Webster's 1913
(1)
WordNet
(5)
Elsewhere on the web
Overshadowing their confrontation was the specter of 2006, when a similar dispute interrupted gas shipments to many European countries for three days.— Latest Headlines - ABC 7 News
Even if both sides in the current Gaza conflict insist that their confrontation is at the center of the world, in reality it isn't anymore.— PA Pundits - International
As any of you who know me understand, engaging in a confrontation is absolutely not my style.— Sierra Sun - Top Stories

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a week.