(OECD), pact signed in Paris, France, Dec. 14, 1960, by Austria, Belgium, Britain, Canada, Denmark, France, Greece, Iceland, Ireland, Italy, Luxembourg, The Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, Turkey, United States, West Germany; Japan became full member April 1964; aims to promote economic growth and financial stability, expand trade, and coordinate aid to underdeveloped nations; effective Sept. 30, 1961; replaced the 18-member OEEC, which did not include the United States and Canada. see also in index International Energy Agency; Organization for European Economic Cooperation; European Organizations,