illegal (illegals plural )
1 adj If something is illegal, the law says that it is not allowed.
oft it v-link ADJ to-inf
It is illegal to intercept radio messages..., ...illegal drugs.
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illegally adv ADV with v
They were yesterday convicted of illegally using a handgun...
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illegality (illegalities plural) n-var
There is no evidence of illegality.
2 adj Illegal immigrants or workers have travelled into a country or are working without official permission.
ADJ n
Illegal immigrants or workers are sometimes referred to as illegals., n-count
...a clothing factory where many illegals worked.