› FINANCE to buy something that you think will go up in value, for example shares or property, in order to make a profit: It's a good time to invest.invest in sth He's not certain whether to invest in the property market.invest sth in sth The fund has invested 65% of its assets in shares. We advise our clients on how to invest wisely.
› FINANCE, BANKING to put money into a bank account, buy insurance, etc. so that you can receive interest or other payments: invest (sth) in sth You can invest up to £5,200 a year in a high-interest savings account.
› to put money, effort, time, etc. into something in order to improve it or get an advantage: invest sth in sth The company plans to invest $325 million in its new plant.fully/heavily invested in sth Generations ago, the government was more heavily invested in higher education. invest time and effort/energy/money in sth → See Note investment