A.D. Anno Domini In the year of the Lord
ad lib. ad libitum at pleasure
a.m. ante meridiem before noon
A.M. Anno Mundi In the year of the world (Hebrew)
cf. confer  compare
D.V. Deo volente God willing
e.g. exempli gratia for example
et al. et alii  and others
etc. et cetera and other things; and so forth
ibid. ibidem  in the same place
i.e. id est  that is
infra dig. infra dignitatem beneath dignity, unworthy of
INRI Iesus Nazarenus Rex Iudaeorum  Jesus of Nazareth King of the Jews
ICQUS Iesous Crustos Qeou Uios  Jesus Christ Son of God (abbrev. - "fish')
J.D. Iurum Doctor Doctor of Law
M.D. Medicinae Doctor Doctor of Medicine
N.B. nota bene note well
op. cit. opere citato in the work mentioned
per cent per centum (%) by the hundred
Ph.D. Philosophiae Doctor Doctor of Philosophy
p.m. post meridiem after noon
P.O. per os  orally
P.R.N. pro re nata for the emergency, as needed
pro tem.  pro tempore for the time being
P.S. post scriptum written afterwards
Q.E.D. quod erat demonstrandum  Which was to be demonstrated.
Q.S. quantum sufficit as much as suffices
q.v. quod vide which see.
R.I.P. Requiescat in pace May rest in peace.
SPQR senatus populusque Romanus  Roman Senate and People..
s.v. sub verbo under the word
viz. videlicet namely
vs. versus  against