Dutch word dat comes from Proto-Indo-European *-h₂, Proto-Indo-European *dʰeh₁-, Proto-Indo-European *-no, Proto-Indo-European - -tis, and later Proto-Indo-European *dʰéh₁tis (Act of putting, placement.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *-h₂ | Proto-Indo-European (ine-pro) | Creates collective nouns, which refer to groups or sets of things. |
| *dʰeh₁- | Proto-Indo-European (ine-pro) | |
| *-no | Proto-Indo-European (ine-pro) | |
| - -tis | Proto-Indo-European (ine-pro) | |
| *tód | Proto-Indo-European (ine-pro) | |
| *dʰéh₁tis | Proto-Indo-European (ine-pro) | Act of putting, placement. |
| *sa | Proto-Germanic (gem-pro) | That. |
| *dēdiz | Proto-Germanic (gem-pro) | Deed, act. |
| thia | Old Dutch (odt) | |
| that | Old Dutch (odt) | That That, that one. |
| dāt | Old Dutch (odt) | |
| * t | Middle Dutch (dum) | |
| dat | Dutch (nld) | That That (neuter); referring to a thing or a person further away. (demonstrative) that, that there. (exophoric) that, those (regardless of gender and number). (relative) who, which, that. |