1.NounSomeone who, or something which, physically resembles (looks like) another.
"The cousins were such close lookalikes they could impersonate each other, and sometimes did.; Among competing products, a generic substitute is one thing, whereas a deceptive lookalike is another."
2.NounA doppelganger, impersonator, imposter, or body double.
"The cousins were such close lookalikes they could impersonate each other, and sometimes did."
3.NounSomething that looks very similar to or the same as the genuine article.
"Among competing products, a generic substitute is one thing, whereas a deceptive lookalike is another."