Wiktionary
a. Describing a period before contact was established (especially with an indigenous people) alt. Describing a period before contact was established (especially with an indigenous people)
Usage examples of "precontact".
Native population: scholars who viewed Native American cultures as primitive reduced their estimates of precontact populations to match the stereotype.
Most current estimates of the precontact population of the United States and Canada range from ten to twenty million.
James Davidson and Mark Lytle do a splendid job telling of the Indian plagues, demonstrating that they understand their geopolitical significance, their devastating impact on Indian culture and religion, and their effect on estimates of the precontact Indian population.
At last, I decided to extend the classical, precontact geometrodynamic formalisms beyond the state they were in when the Tabernacle left the solar system.