noun, plural eight⋅ies, adjective | 1. | a cardinal number, ten times eight. |
| 2. | a symbol for this number, as 80 or LXXX. |
| 3. | a set of this many persons or things. |
| 4. | eighties, the numbers, years, degrees, or the like, from 80 through 89, as in referring to numbered streets, indicating the years of a lifetime or of a century, or degrees of temperature. |
| 5. | amounting to 80 in number. |