domnus

Etymology
Syncope of, optional in Classical Latin and widespread in Vulgar and Late Latin.

Noun

 * 1) lord
 * 2) master
 * 1) master

Usage notes
In modern, the vocative domne may be used when addressing others in a liturgical context, but the full form Domine is always used when addressing God. This distinction is already attested in the era: the retention of the form dominus for God by Christians at that time was likely a conscious archaism implying special dignity, rather than evidence that domnus was felt to be nonstandard.