a fortiori

Even more so (when proving a point)

in actu functionis

In the act of the function

in coram Sanctissimo

In the presence of the Blessed Sacrament

in plano / in planum

On the floor (of the sanctuary) (ablative form: no motion) / on the floor (accusative form; motion)

cum ratione accommodationis

With rational accommodation

solita oscula

With the customary kisses