Where does “matere” come from?

matere (Anglo-Norman) comes from Latin māteria, from Latin māter, from Proto-Italic mātēr, from Proto-Indo-European méh₂tēr — mother.

Ancestry of “matere”, step by step

Step	Language	Word	Meaning
1	Latin	māteria	—
2	Latin	māter	—
3	Proto-Italic	mātēr	mother
4	Proto-Indo-European	méh₂tēr	mother

matere — Etymology, Origin & Word History | Etymology Explorer