firm

A business partnership; the name under which it trades.

A business enterprise, however organized.

A criminal gang, especially based around football hooliganism.

To make firm or strong; fix securely.

To make compact or resistant to pressure; solidify.

To become firm; stabilise.

To improve after decline.

Steadfast, secure, solid (in position)

"It's good to have a firm grip when shaking hands."

Fixed (in opinion)

"He was firm that selling his company would a good choice and didn't let anyone talk him out of it."

Durable, rigid (material state)

"firm flesh; firm muscles, firm wood; firm land (i.e. not soft and marshy)"