1. occurring or existing after the development or use of atomic weapons or nuclear technology
Usage: often used in historical or speculative contexts
2. relating to or characteristic of the period following a nuclear war or catastrophe
Usage: often used in science fiction and dystopian literature

Examples

• The novel depicts a postatomic world where civilization has collapsed.
• Historians debate the geopolitical implications of the postatomic era.
• Postatomic fiction explores survival in a nuclear wasteland.
• The postatomic age began with the development of nuclear weapons.
• Scientists study postatomic radiation effects on ecosystems.