Proximo in a sentence as an adjective

" = tenth day of current month indicated in date of document* "The 10th ultimo" / "10th ult." = tenth day of month preceding the one indicated in date of document* "The 10th proximo" / "10th prox.

Proximo definitions

adjective

in or of the next month after the present; "scheduled for the 6th prox"

See also: prox