From Glossary of Meteorology
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Any strengthening or development of anticyclonic circulation in the atmosphere; the opposite of anticyclolysis.

This applies to the development of anticyclonic circulation (or the initial appearance of a high) where previously it was nonexistent, as well as to intensification of existing anticyclonic flow. The most common application of this term is to the formation of a new anticyclone. Care should be taken, however, to distinguish the increase in anticyclonic circulation from the increase in atmospheric pressure (filling), although they usually occur simultaneously.
Compare cyclogenesis.

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