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X ray

(Encyclopedia)CE5 Typical X-ray composite spectrum (intensity as a function of frequency) X ray, invisible, highly penetrating electromagnetic radiation of much shorter wavelength (higher frequency) than visibl...

dye

(Encyclopedia)dye, any substance, natural or synthetic, used to color various materials, especially textiles, leather, and food. Natural dyes are so called because they are obtained from plants (e.g., alizarin, cat...

Federal Trade Commission

(Encyclopedia)Federal Trade Commission (FTC), independent agency of the U.S. government established in 1915 and charged with keeping American business competition free and fair. The FTC has no jurisdiction over ban...

Unitarianism

(Encyclopedia)Unitarianism, in general, the form of Christianity that denies the doctrine of the Trinity, believing that God exists only in one person. While there were previous antitrinitarian movements in the ear...

Gnosticism

(Encyclopedia)Gnosticism nŏsˈtĭsĭzəm [key], dualistic religious and philosophical movement of the late Hellenistic and early Christian eras. The term designates a wide assortment of sects, numerous by the 2d c...

competition, in economics

(Encyclopedia)competition, in economics, rivalry in supplying or acquiring an economic service or good. Sellers compete with other sellers, and buyers with other buyers. In its perfect form, there is competition am...

Swiss literature

(Encyclopedia)Swiss literature. The literature of Switzerland is written in German, French, Italian, and Romansh, with German predominating. The extensive literature in Romansh dialect (see Rhaeto-Romanic) is littl...

Rockefeller, John Davison

(Encyclopedia)Rockefeller, John Davison, 1839–1937, American industrialist and philanthropist, b. Richford, N.Y. He moved (1853) with his family to a farm near Cleveland and at age 16 went to work as a bookkeeper...

tap dance

(Encyclopedia)tap dance, theatrical dance form in which the dancer, wearing shoes with metal heel and toe taps, beats out complex, syncopated rhythms on the floor. After a slump in popularity in the 1960s, tap ...

Congregationalism

(Encyclopedia)Congregationalism, type of Protestant church organization in which each congregation, or local church, has free control of its own affairs. The underlying principle is that each local congregation has...