semel pro semper

From semel (“once”) + prō (“for”) + semper (“always”).

• (Classical Latin) IPA^(key): /ˈse.mel proː ˈsem.per/, [ˈs̠ɛmɛɫ̪ proː ˈs̠ɛmpɛr]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈse.mel pro ˈsem.per/, [ˈsɛːmel prɔː ˈsɛmper]

semel prō semper

1. (idiomatic) once and for all