American Heritage Dictionary
(2)
Century Dictionary
(4)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
For but one example: When its presumptive leader de facto calls the presumptive leader of my party a traitor, what am I to think he thinks of me since I agree with Senator Obama's position on Iraq?— The Ostroy Report
For nearly two weeks, Democrats have repeatedly hit Sen. John McCain, R-Ariz., for saying he is unaware of how many houses he owns, calling the presumptive Republican presidential nominee out of touch with everyday Americans.— The Moderate Voice
348 Heir-presumptive, iv.— A History of the Four Georges and of William IV, Volume IV (of 4)
His nephew and heir presumptive, John Feversham, [fictitious person] was coming with him.— Clare Avery A Story of the Spanish Armada
If you're gettin' on, I'm gettin' off Hon. John Fellowes Wallop, of Barton House, Morchard Bishop brother and heir-presumptive of the Earl of Portsmouth, entered his 57th pear on Monday Western Times.— Punch, or the London Charivari, Vol. 150, January 12, 1916

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 month.
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