Common Latin words/phrases

ad hoc
for this purpose only

carpe diem
seize the day

circa
around, approximately

de facto
from the fact

ergo
therefore

et cetera
and the others

in flagrante delicto
in the act of committing a crime

ipso facto
by that very fact

mea culpa
my fault

modus operandi
method or mode of operating

per se
by/in itself

persona non grata
person not appreciated

pro bono (publico)
for the public good: professional work undertaken voluntarily and without payment

status quo
existing state of affairs

terra incognita
unknown land

vox populi
the voice of the people