<p><strong>Noun</strong></p><ul><li>the act or process of bringing workers into a labor union, an organization for dealing collectively with employers: The decline of unionization has contributed to the rise of economic inequality in the United States over the past several decades.</li><li>the process of subjecting an industry, profession, or region to the regulations of one or more labor unions: He sees the dawning unionization of Silicon Valley as an ominous development.</li></ul>