American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
Also, we talked about how awesome it is that escalate is a back-formation of escalator, so it's actually a modern word!— MetaFilter
Most of the time, I can't show you my work, unless I make it up by back-formation.— Aliens in This World
The Merriam-Webster Online states that "liaise" is an example of a "back-formation," through which a new word is extracted from another, perfectly legitimate word on the assumption that it must exist, etymologically, although it does not.— Yankee Pot Roast

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