say it: il-EE-guhl
illegal is an adjective meaning "prohibited by law or by official or accepted rules". It carries one recorded sense.
prohibited by law or by official or accepted rules
“an illegal chess move”
Definitions, synonyms and semantic relations for illegal come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.