Part of the IT standards and organizations glossary: The Stefan-Boltzmann constant, symbolized by the lowercase Greek letter sigma (), is a physical constant involving black body radiation.A black body, also called an ideal radiator, is an object that radiates or absorbs energy with perfect efficiency at all electromagnetic wavelength s.art of the IT standards and organizations glossary: The Stefan-Boltzmann constant, symbolized by the lowercase Greek letter sigma (), is a physical constant involving black body radiation.
Definition of memoir for English Language Learners. memoirs : a written account in which someone (such as a famous performer or politician) describes past experiences.
uk â /Ërem.ÉªËnÉªs/ us â /Ërem.ÉËnÉªs/ formal. âº to talk or write about past experiences that you remember with pleasure: My grandfather used to reminisce about his years in the navy. Thesaurus: synonyms and related words. Remembering, reminding and reminders.