Meaning of firm in English

Adjective

1. strong and solid, not yielding to a touch or pressure; hard, not soft

firm ground

2. strongly fixed in a position and not likely to move; security in position

He walked with firm steps.

3. strongly felt and not likely to change; determined

a firm belief

4. having steady power or strength

a firm grip
a firm voice

firm²

Noun

1. a group of people who work together; a business or company

I set up[established] an advertising firm with friends.