What is the meaning of Montem?

A former custom of Eton schoolboys to go to a hill on the Bath road every third Whit Tuesday to demand 'salt-money' from passers-by, for the university expenses of the senior scholar or school captain.

inflection of montar:

1. third-person plural present subjunctive
2. third-person plural imperative

third-person plural present subjunctive

third-person plural imperative

accusative singular of mōns

inflection of montar:

1. third-person plural present subjunctive
2. third-person plural imperative

third-person plural present subjunctive

third-person plural imperative

Source: wiktionary.org