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excursus

[ ek-skur-suhs ]
/ ɛkˈskɜr səs /
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noun, plural ex·cur·sus·es, ex·cur·sus.

a detailed discussion of some point in a book, especially one added as an appendix.
a digression or incidental excursion, as in a narrative.

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Origin of excursus

1795–1805; <Latin: a running out, sally, digression, derivative of excurrere to run out. See ex-1, course
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for excursus

excursus
/ (ɛkˈskɜːsəs) /

noun plural -suses or -sus

an incidental digression from the main topic under discussion or from the main story in a narrative
C19: from Latin: a running forth, from excurrere to run out
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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