Definition of influent in English:

Share this entry


Pronunciation: /ˈinflo͝oənt/


Flowing in: the influent lines were relocated while waste water was still flowing
More example sentences
  • Use at least a 4-inch diameter sewer line (also known as influent line or distribution pipe) from the house to the lagoon.
  • In summer, influent waters are commonly warm and enter the uppermost waters, but cooler rainwater falling at night may sink to the level of the thermocline before moving out into the basin.
  • The high sludge yields were caused by unexpectedly high and erratic levels of influent solids for which the builders were not responsible.


1A stream, especially a tributary, that flows into another stream or lake.
Example sentences
  • The method involves the steps of continuously flowing an influent into a treatment basin and continuously flowing an effluent out of the treatment basin into a clarifier.
  • This proves that the presence of ASP effluent in the Knostrop influent is not detrimental to settlement and that the Knostrop influent is capable of good settlement with proper operation.
  • In an extensive survey of U.S. wastewater treatment plants, Schulz has found perfluorinated compounds in influents and effluents.
1.1 Ecology A nondominant organism that has a major effect on the balance of a plant or animal community.
Example sentences
  • fnu typically ranges from 0.00-0.04 for raw influents and from 0.00-0.05 for settled influents.
  • In Chile, a pending study by Claudio Miranda, of the Laboratory of Aquatic Pathology, found antibiotic-resistant bacteria in fish farm effluent that was ‘significantly higher ‘than the influent, the feed or any other element.’


Late Middle English (as an adjective): from Latin influent- 'flowing in', from influere (see influence). The noun is recorded from the mid 19th century.

For editors and proofreaders

Syllabification: in·flu·ent

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.