  We show that data collected from corpuses of documents violate the
Clauser-Horne-Shimony-Holt version of Bell's inequality (CHSH inequality) and
therefore indicate the presence of quantum entanglement in their structure. We
obtain this result by considering two concepts and their combination and
coincidence operations consisting of searches of co-occurrences of exemplars of
these concepts in specific corpuses of documents. Measuring the frequencies of
these co-occurrences and calculating the relative frequencies as approximate
probabilities entering in the CHSH inequality, we obtain manifest violations of
the latter for all considered corpuses of documents. In comparing these
violations with those analogously obtained in an earlier work for the same
combined concepts in psychological coincidence experiments with human
participants, also violating the CHSH inequality, we identify the entanglement
as being carried by the meaning connection between the two considered concepts
within the combination they form. We explain the stronger violation for the
corpuses of documents, as compared to the violation in the psychology
experiments, as being due to the superior meaning domain of the human mind and,
on the other side, to the latter reaching a broader domain of meaning and being
possibly also actively influenced during the experimentation. We mention some
of the issues to be analyzed in future work such as the violations of the CHSH
inequality being larger than the `Cirel'son bound' for all of the considered
corpuses of documents.

Artificial Intelligence;Quantum Physics