Relating to or characterized by streams or currents flowing together and uniting; pertaining to confluence.
From coeffluent + -ial (suffix forming adjectives). An adjectival form emphasizing the characteristic of being coeffluent or of flowing together.
Coeffluential is almost never used in modern English, having been replaced by 'confluent,' but it represents an older, more elaborate style of scientific description that valued precision and nuance in every word.
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