WordReference Random House Unabridged Dictionary of American English © 2025
il•le•gal•ize
(i lē′gə līz′),USA pronunciation v.t., -ized, -iz•ing. Also,[esp. Brit.,] il•le′gal•ise′.
il•le′gal•i•za′tion, n.
- Lawto make illegal:They even wanted to illegalize smoking.
- illegal + -ize 1810–20