1. no longer existing; having died out completely
Usage: often used of species or groups of animals/plants
2. no longer active or functioning
Usage: used of volcanoes, fires, or other phenomena

Examples

• Dinosaurs became extinct millions of years ago.
• The dodo bird is an extinct species.
• Many languages are now extinct due to globalization.
• The volcano has been extinct for centuries.
• Scientists study extinct civilizations through archaeology.
• The campfire was completely extinct by morning.
• Conservation efforts aim to prevent species from becoming extinct.