Multiple states or instances of concurrence; simultaneous occurrences or agreements (alternative plural form).
A variant or alternative plural of concurrence using the -ies ending, which became productive in English but concurrences is the standard modern plural. This variant may reflect older English pluralization patterns or regional usage.
This alternate plural form is a linguistic fossil—modern English prefers 'concurrences,' but 'concurrencies' shows how English speakers in the past were still experimenting with how to pluralize these complex Latin-derived nouns with multiple possible endings.
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