noun, plural -ties, adjective | 1. | a cardinal number, ten times six. |
| 2. | a symbol for this number, as 60 or LX. |
| 3. | a set of this many persons or things. |
| 4. | sixties, the numbers, years, degrees, or the like, from 60 through 69, as in referring to numbered streets, indicating the years of a lifetime or of a century, or noting degrees of temperature: Her grandfather is in his late sixties. The temperature is in the low sixties. |
| 5. | amounting to 60 in number. |
| 6. | like sixty, Informal. with great speed, ease, energy, or zest: Everyone was working like sixty to finish up before the holidays. |