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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.
to appear similar. All these cars look alike these days. The twins look alike and not many people can tell them apart.