Definition of nationalism
1
: loyalty and devotion to a nation
especially
: a sense of national consciousness (see consciousness sense 1c) exalting one nation above all others and placing primary emphasis on promotion of its culture and interests as opposed to those of other nations or supranational groups
Intense nationalism was one of the causes of the war.
2
: a nationalist movement or government
opposing nationalisms
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Merriam-Webster unabridged
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Time Traveler for nationalism
The first known use of nationalism was in 1798
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