Something that is permanent lasts for ever.

You use permanent to describe situations or states that keep occurring or which seem to exist all the time; used especially to describe problems or difficulties.

A permanent employee is one who is employed for an unlimited length of time.

Your permanent home or your permanent address is the one at which you spend most of your time or the one that you return to after having stayed in other places.

A permanent is a treatment where a hair stylist curls your hair and treats it with a chemical so that it stays curly for several months.