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.
Cover of the first English edition of Benjamin Franklin's autobiography, 1793. An autobiography (from the Greek, Î±á½ÏÏÏ-autos self + Î²Î¯Î¿Ï-bios life + Î³ÏÎ¬ÏÎµÎ¹Î½-graphein to write) is a self-written account of the life of a person. The word autobiography was first used deprecatingly by William Taylor in 1797 in the English periodical The Monthly Review, when he suggested the word as a hybrid, but condemned it as pedantic.