One of the mysteries of the English language finally explained.
1Depreciative. The use of (or tendency to use) ad hoc measures, rather than general long-term strategies, to deal with issues, situations, etc.
2Architecture. Frequently in form adhocism. In the terminology of Charles Jencks (b. 1939): the practice or movement of building in a style characterized by spontaneity, invention, and individuality, in order to achieve social variety in modern cities.
1950s; earliest use found in The American Economic Review. From ad hoc + -ism.
ad hocism/ˌad ˈhɒkɪz(ə)m/
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