The phrase "to define that contribution" means to clearly and precisely explain or determine the importance or impact of something that someone has contributed or added to a particular situation or event. Full definition
Some employers in both the public and private sectors are considering the replacement of defined benefit plans with defined contribution plans. (ebri.org)
If you are saving for retirement in an RRSP or a company defined contribution pension plan, your retirement security might well depend on the future direction of interest rates. (business.financialpost.com)
As opposed to defined benefit plans, employees have accounts in defined contribution plans. (investopedia.com)