noun Meteorology.
the formation or increase of a front or frontal zone.
Compare frontolysis.

1930–35; fronto- + -genesis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
frontogenesis (ˌfrʌntəʊˈdʒɛnɪsɪs)
meteorol the formation or development of a front through the meeting of air or water masses from different origins

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
frontogenesis   (frŭn'tō-jěn'ĭ-sĭs)  Pronunciation Key 
The formation or intensification of a meteorological front caused by an increase in the horizontal thermal gradient (the difference in temperature of adjacent air masses) over time. Compare frontolysis.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Strong frontogenesis is often occurring within this area.
With a strong upper level trough and mid level frontogenesis, forcing was
  definitely not lacking with this event.
Note that the maximum frontogenesis is within the jet entrance region.
Note the enhanced axis of frontogenesis near the coast where higher values of
  snow were observed.
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