The condition of retaining (keeping) something. "You may be able to memorize facts in the short-term, but how well is your retention of those facts over the long-term?" "Successful companies need to foster a good workingenvironment so that employee retention remains at a high level." See also retention clause, retention period, and retention ratio. 
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USAGE EXAMPLE

The employee retention at the company was very high due to a combination of high wages, benefits, and employee fulfillment programs.