antediluvian

Antediluvian is an adjective that denotes the period before the biblical Flood, and more broadly something extremely old. The word derives from Latin ante (before) and diluvium (flood). It entered English in the 17th century, primarily in theological and scholarly contexts to describe the era preceding Noah’s Flood and its inhabitants.

In religious usage, antediluvian refers to the world described in Genesis as existing prior to the Flood. The term is often associated with the genealogies and long-lived patriarchs that, in biblical narrative, predated the deluge. In some traditions, the antediluvian world is portrayed as morally corrupt or socially unified before the Flood, though formulations vary by interpreter.

In scientific and scholarly discourse, the term is used chiefly in historical or literary discussions about pre-flood narratives. It is not a technical term in mainstream geochronology; when invoked, it usually signals discussion of pre-Flood myths, ancient legends, or archaic ideas about Earth’s early history.

In contemporary usage, antediluvian can describe anything extremely old-fashioned or outdated. For example, an antediluvian telephone system or antediluvian appliances might be mentioned in a humorous or critical context. The term remains common in literature and journalism as a colorful synonym for antiquated, with varying tonal implications.