romanticism (n.)

1803, "a romantic idea," from romantic + -ism. In literature, 1823 in reference to a movement toward medieval forms (especially in reaction to classical ones) it has an association now more confined to Romanesque. The movement began in German and spread to England and France. Generalized sense of "a tendency toward romantic ideas" is first recorded 1840.

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Definitions of romanticism from WordNet
romanticism (n.)
impractical romantic ideals and attitudes;
romanticism (n.)
an exciting and mysterious quality (as of a heroic time or adventure);
Synonyms: romance
Romanticism (n.)
a movement in literature and art during the late 18th and early 19th centuries that celebrated nature rather than civilization;
Synonyms: Romantic Movement