1. the numbers from 80 to 89, especially when referring to temperature or age
2. the decade from 1980 to 1989
3. the years of a person’s life from age 80 to 89

Examples

• The temperature reached the low eighties today.
• My grandmother is in her eighties but still very active.
• The eighties were known for distinctive music and fashion.
• He was born in the eighties and grew up with video games.
• The thermometer showed it was in the upper eighties.
• She remembers the eighties as a time of economic growth.
• Both my grandparents are in their early eighties.