1. in a manner relating to or occurring in the period of human history before written records existed

Examples

• Humans prehistorically relied on hunting and gathering for survival.
• The cave paintings were created prehistorically, thousands of years before writing was invented.
• Prehistorically, people used stone tools to hunt and process food.
• Many civilizations developed agriculture prehistorically before establishing permanent settlements.
• The structure was built prehistorically, long before recorded history began.