The result returned by Google Analytics for the keyword when the search was conducted on Google by a user who is logged into Google.
In Google Analytics, the search term used to access your site is reported under the Traffic Source tab in Sources > Search > Organic. Beginning in October 2011 Google began to block the referral data including keyword data from searchers who are logged into any Google property (ostensibly to protect the searchers’ privacy). All searches by logged in users are now reported as “(not provided)”.
NOTE: On September 23, 2013 a report on the Threadwatch forum stated that Google has begun the process of redirecting all searches to https (secure searches) which will have the effect of hiding all Google keyword data from Google Analytics users.