If you invest in something, or if you invest a sum of money, you use your money in a way that you hope will increase its value, for example by paying it into a bank, or buying shares or property.

When a government or organization invests in something, it gives or lends money for a purpose that it considers useful or profitable.

If you invest in something useful, you buy it, because it will help you to do something more efficiently or more cheaply.

If you invest time or energy in something, you spend a lot of time or energy on something that you consider to be useful or likely to be successful.

If you say that someone or something is invested with a particular quality, you mean that they seem to have that quality.

To invest someone with rights or responsibilities means to give them those rights or responsibilities legally or officially.