Vivat or Vivant?

by Master Richard the Poor of Ely

This is a quick lesson in Latin grammar to keep people from making an
error when they toast someone with the traditional cry of "Vivat!" at
an event.

The word "vivat" is a verb that means "live"; it is the third person
singular form in the indicative active case of the verb "vivare". That
is, it means "he lives", "she lives", or "it lives", the pronoun being
understood.      The key here is that it is the SINGULAR form. When you
are wishing life to more than one person or thing, you should use the
plural form "vivant".

This is especially important when toasting the Crown.  Using the
singular form means you are only wishing life to one of Their
Majesties, and are therefore committing treason!

from the October 1997 Seahorse