share

When you share something, you let another person use it.

Example: We can both sit down if you share the chair.

When two people divide a thing between them, they share that thing.

Example: I will share this big piece of cake with you.

Several people can get a share of something if they divide it between them.

Example: I will give you a share of this big bag of candy.

A share is a part of a company's capital, it entitles the holder to a proportion of the profits.