1. noun A person or thing that looks very similar to another person or thing. When used as a noun, the term is often hyphenated or spelled as one word. After the product proved immensely popular, a number of cheap lookalikes started popping up all over the place. The TV show had to bring on a look-alike after one of the stars passed away in the middle of filming the third season.

2. verb To look very similar to another person or thing. To be honest, a lot of the small towns in this part of the country look alike. I was so tired and stressed during the exame that all the answers started looking alike. The old bigot said that all people of that ethnicity look alike to him.