I was looking at Jastrow and there were several English abbreviations related to the definition or word structure that I didn't recognize. I looked through this and many of the abbreviations are there but many are not.
First - these: Pa. Af. Ithpe.
I looked in the Sefaria MongoDB dump and these are in a field called "verbal_stem" - but I'm not sure what that means. It seems they are related to the verb binyan, but I'm not sure each one - eg, what is Af.? There are other forms that I've seen I don't recognize.
A little further down (word: נֶצַח) it says: "wherever the Biblical text has the words netsaḥ, selah, or vaʿed, it means &c." What is that "&c."?
Further is: "נַצְחָא m. (preced. wds.)" What is the wds.?
I could go on. I would appreciate answers to these specific examples but I would really like some pointers or links that can explain it generally for all the examples I didn't list here.