mean lower low water

noun

A reference tidal height equal to the average of the daily lower low water heights of a 19-year period (the National Tidal Datum Epoch).

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Meanings

nounmean lower low water (plural mean lower low waters, abbreviation MLLW)

plural mean lower low waters · abbreviation MLLW

  1. USA reference tidal height equal to the average of the daily lower low water heights of a 19-year period (the National Tidal Datum Epoch).
Cite this entry
APA

mean lower low water. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/mean%20lower%20low%20water

MLA

“mean lower low water.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/mean%20lower%20low%20water. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “mean lower low water,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/mean%20lower%20low%20water.

Source: mean lower low water on Wiktionary, CC BY-SA 4.0.