Chabad Knowledge Base
(lit. “enhancement of the mitzvah” or "beautification of the mitzvah); enhancement or meticulous observance of a mitzvah (divine commandment) beyond the formal demands of the law.
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Entry for 'Hiddur Mitzvah'. Chabad Knowledge Base. https://www.studylight.org/dictionaries/eng/ckb/h/hiddur-mitzvah.html. 2012.