Relating to the period before the Biblical flood, or very ancient and primitive; outdated or extremely old-fashioned.
From Latin 'ante' (before) + 'diluvium' (flood). Originally theological, referring to the time before Noah's flood, later applied metaphorically to anything very old or primitive.
The term 'antediluvian' is used sarcastically today to describe outdated technology or customs—it became popular in the 1700s as people wanted a dramatic way to say 'incredibly ancient,' playing on the catastrophic image of the biblical deluge.
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