Feci is the third principle part of the verb facio, or to
do/make. Because it has a t at the end, that means it is in the
perfect tense, 3rd person. So fecit means he/she/it made/has made
or did/has done.
The Latin sentence 'Dominus fecit' may mean The Lord has made. Or it may mean The Lord has acted. In the word-by-word translation, the noun 'Dominus' means 'Lord'. The verb 'fecit' means '[he/she/it] acts or makes, does act or make, is acting or making'.