"Belles-lettres or belles lettres is a category of writing, originally meaning beautiful or fine writing. In the modern narrow sense, it is a label for literary ...
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works that do not fall into the major categories such as fiction, poetry, or drama. The phrase is sometimes used pejoratively for writing that focuses on the aesthetic qualities of language rather than its practical application. A writer of belles-lettres is a belletrist.
Literally, belles-lettres is a French phrase meaning "beautiful" or "fine" writing. In this sense, therefore, it includes all literary works—especially fiction, poetry, drama, or essays—valued for their aesthetic qualities and originality of style and tone. The term thus can be used to refer to literature generally. The Nuttall Encyclopedia, for example, described belles-lettres as the "department of literature which implies literary culture and belongs to the domain of art, whatever the subject may be or the special form; it includes poetry, the drama, fiction, and criticism," while the Encyclopædia Britannica Eleventh Edition describes it as "the more artistic and imaginative forms of literature, as poetry or romance, as opposed to more pedestrian and exact studies."" - (en.wikipedia.org 08.09.2020)