1 a : the act of using money to earn more money : the act of investing money
He became wealthy by shrewd investment of his money in the stock market.
She got a good return on her investment. [=her investment earned a good profit]
The company hopes to attract foreign investment. [=hopes that foreign people/companies will invest money in it]
Buying the house was a good investment.
The financial company offers several kinds of investments.
1 b [count] : an amount of money that is invested in something
Her initial investment was $2,000.
2 [count] : something that you buy with the idea that it will increase in value, usefulness, etc.
The house turned out to be a good investment. [=the house increased in value and they made a good profit when they sold it]
A college education is a very good investment.
3 a : the act of spending money on something that is valuable or expected to be useful or helpful
The government has set aside money for investment in public transportation.
The company needs to make more investments in technology.
3 b [count, noncount] : the act of giving your time or effort in order to accomplish something or make something better
The project will require (a) substantial investment of time and energy.