providing a choice, esp between two options; able to be used instead of something else

Is there an alternative route?

constituting an alternative

We will adopt your alternative suggestion

of or relating to an activity or procedure that differs from the conventional forms

alternative technology

alternative theatre

another different person or thing that could act as a replacement

an opportunity to choose between two or more possibilities

I had no alternative but to report him to the police

one of two or more possibilities between which a choice is to be made