As nouns the difference between secession and defection
is that secession is the act of seceding while defection is an act or incidence of defecting.
secession
English
Usage notes
A common example of usage is the withdrawal of 11 Southern states of the United States of America from the Union in 1860–1861, precipitating the U.S. civil war
Related terms
* secessionist
defection
English
Noun
(
en noun)
an act or incidence of defecting
Related terms
* defect
* defective
* defector
* deficiency
* deficient
* deficit