nominative
nominativus
The case of the subject: who or what acts, or whom the sentence is about. In the prayers it often stands with an understood “is” — Latin likes to drop the copula.
It is the dictionary form of a noun in the singular — the one you find in the entry.
in the texts
the Lord [is] with thee — the subject with an understood “est”.
the will — the subject of the petition: what is to be done?
glory [be] — a nominative with the verb left unexpressed.