When we write with reference to the time of day 'p.m.' - [post meridiem] it is in lower case, but if it was used as a title, say of a poem or suchlike, would it qualify for the upper case, viz. 'Post Meridiem'.
I kind of think it would, but it looks a bit wrong.
Interesting - I've always see it as Meridian, not Meridiem - it seems either will do?
I would say lower case in general correspondence, but the protocol of titles of books, poems etc usually uses upper case for the significant words of the title.
but funnily enough I know how to write Latin in the late republican age, because we dug up the earliest written Latin on papyrus ( rather than stone and too early for paper) here
http://en.wikipedia.org/wiki/Cornelius_Gallus
There seems to be some disunity here :0) methyl; are you saying that it should be all lower case, - post meridiem - even when its a title of something?
I've just been hunting around the shelves and Wilfred Owen's 1917 poem is entitled in one version 'Dulce et Decorum est' and another 'Dulce et Decorum est pro patria mori'.
I think yer pays yer money an' takes yer choice. Well anyway we have gone for capitalization of both words, - publish and be damned!