There are multiple definitions - click on the translation that matches your context.
pension fund means:
Substantiv
partial
noun
Inasmuch as this German pension vehicle enjoys that same flexible investment options that traditional pension funds in the Anglo-American world have, this translation is fairly accurate and is the most widely used English translation.
money and investments used to provide pensions for employees who no longer work at the company because they have reached the pension age (=the age when you can stop working and begin to receive regular sums of money from the state, a pension company, or an employer's pension fund)
He said the council's tobacco investment was less than 1% of its pension fund.