A takkanah (plural takkanot) is a major legislative enactment within halakha (Jewish law), the normative system of Judaism's laws. A takkanah is an enactment which revises an ordinance that no longer satisfies the requirements of the times or circumstances, or which, being deduced from a biblical passage, may be regarded as new. It is, therefore, the antithesis of the gezerah. The term is applied also to the institution provided for in the enactment.