English word deca- comes from Proto-Indo-European *déḱm̥ (Ten.), Proto-Indo-European *déḱ-
| Dictionary entry | Language | Definition |
|---|---|---|
| *déḱm̥ | Proto-Indo-European (ine-pro) | Ten. |
| *déḱ- | Proto-Indo-European (ine-pro) | |
| *dékə | Proto-Hellenic (grk-pro) | Ten. |
| δέκα | Ancient Greek (grc) | |
| δέκας | Ancient Greek (grc) | |
| decas | Late Latin (LL) | |
| deca- | English (eng) | In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10. Symbol: da. Ten. |