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.
Memoir (from French: memoire : mÃ©moire, memoria meaning memory or), reminiscence is a literary nonfiction. genrehis kind of memoir refers to the idea in ancient Greece and Rome, that memoirs were like memos, or pieces of unfinished and unpublished writing, which a writer might use as a memory aid to make a more finished document later on.