American Heritage Dictionary
(4)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
Once we take into account quality, then it is possible that private hospitals may out-preform public hospitals with respect to efficiency.— Healthcare Economist
The manufacturing breakthrough that made this possible is a system of drawing out a foot-long "preform" with millimeter-thick layers, into hundreds of meters of fiber with micron-thick layers.— Medgadget
Regardless of who is in the bullpen this year, they are going to preform or get replaced by someone else who can.— Major League Baseball
Instantly from the issing I got an erection, to the point where Hard and able to preform intercourse, though it didn't last long.— Yahoo! Answers: Latest Questions
However, I don't feel that the singers in our Centre have the talent to preform it properly, to do either my words or Hannah's music justice.— I Was Born2Cree8

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 year.
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