1. People who lived before the biblical flood; those from an extremely ancient time.
Usage: Often used in historical or religious contexts; Plural form of antediluvian
2. People or things that are extremely old-fashioned or outdated.
Usage: Informal usage; often humorous or derogatory

Examples

• The antediluvians mentioned in ancient texts lived in a world very different from ours.
• My grandfather's collection of vinyl records makes him seem like one of the antediluvians to my younger siblings.
• Scholars debate the lifespans attributed to the antediluvians in biblical genealogies.
• She joked that her parents were antediluvians for refusing to use smartphones.
• The museum exhibit explored theories about how the antediluvians built their civilizations.
• He called the old computer system a relic of the antediluvians.