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.
Full Definition of MEMOIR. 1. : an official note or report: memorandum. 2. a: a narrative composed from personal experience b: autobiography âusually used in plural c: biography. 3. a: an account of something noteworthy: report b plural: the record of the proceedings of a learned society.â memÂ·oirÂ·ist \-ist\ noun.emoirs: a written account in which someone (such as a famous performer or politician) describes past experiences. : a written account of someone or something that is usually based on personal knowledge of the subject.