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.
Memoirs vs. Autobiographies. Memoirs are typically classified as a subgenre of the autobiography. The main difference is that a memoir is more focused. An autobiography typically spans a person's entire life and contains intricate details like the writer's family history and childhood. A memoir, on the other hand, is much more centralized.