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.
By Richard Nordquist. Definition: A form of creative nonfiction in which an author recounts experiences from his or her life. A memoir, says Gore Vidal, is how one remembers one's own life, while an autobiography is history, requiring research, dates, facts double-checked. form of creative nonfiction in which an author recounts experiences from his or her life. A memoir, says Gore Vidal, is how one remembers one's own life, while an autobiography is history, requiring research, dates, facts double-checked.