Deepening of a low pressure system associated with the continuing development of a mid-latitude cyclone (storm).

The rapid development of a low or intensification of a pre-existing one

Term that describes the beginning or creation of a new cyclone.

The process that creates a new low pressure system or cyclone, or intensifies a pre-existing one. It is also the first appearance of a trough.

the development or intensification of a low-pressure center ( cyclone)

The formation and intensification of a low-pressure center.

Any development or strengthening of cyclonic circulation in the atmosphere.

Process of cyclone formation, maturation, and death.

Cyclogenesis is the development or strengthening of cyclonic circulation in the atmosphere (a low pressure area).Arctic Climatology and Meteorology. http://nsidc.org/arcticmet/glossary/cyclogenesis.html Cyclogenesis. Retrieved on 2006-12-04. It is the opposite of cyclolysis, and has an anticyclonic (high pressure system) equivalent - Anticyclogenesis.