upper boundary

noun

The most ancient time encompassed by a given period of time.

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Meanings

nounupper boundary (plural upper boundaries)

plural upper boundaries

  1. human sciencesThe most ancient time encompassed by a given period of time.
  2. geographyThe most recent time encompassed by a given geological period.
Cite this entry
APA

upper boundary. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/upper%20boundary

MLA

“upper boundary.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/upper%20boundary. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “upper boundary,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/upper%20boundary.

Source: upper boundary on Wiktionary, CC BY-SA 4.0.