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formal operations

Overview page. Subjects: Psychology.

In the theory of cognitive development of the Swiss psychologist Jean Piaget (1896–1980), the developmental stage beginning at about 12 years when children become proficient in manipulating...

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in The Oxford Dictionary of Phrase and Fable

January 2005; p ublished online January 2006 .

Reference Entry. Subjects: History of English. 176 words.

Berlin airlift an operation by British and American aircraft to airlift food and supplies to Berlin in 1948–9, while Russian forces blockaded the city to isolate it from the West and...

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