| var. of deca- before a vowel: decathlon. |
| 1. | (in prescriptions) pour off. Origin: < L dēcantā ![]() |
| 2. | deceased. |
| 3. | decimeter. |
| 4. | declension. |
| 5. | decrease. |
| 6. | Music. decrescendo. |
| the twelfth month of the year, containing 31 days. Abbreviation: Dec. |

deca- or dec- or deka- or dek-
pref.
Ten: decane.
| deca-
A prefix that means "ten," as in decahedron, a polygon having ten faces. |
dec programming
/dek/ decrement, decrease by one. Especially used by assembly language programmers, as many assembly languages have a "dec" mnemonic.
Opposite: inc.
[The Jargon File]
| dec decoration |
DEC
|