American Heritage Dictionary
(5)
Century Dictionary
(12)
GNU Webster's 1913
WordNet
(2)
Elsewhere on the web
Greater efficiency translates into increased track capacity capability, which means far-improved operations and the more expeditious movement of more trains than what currently exists.— California Progress Report
Another efficiency is energy efficiency, and for the first time Apple is offering a Solid State Drive (SSD) option for Xserve, which reduces power draw, heat, and noise vs. a normal hard drive and costs $500.— Low End Mac

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 once a day.
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