form analysis and translation based on Perseus (Version 2010):
ab   by (agent), from (departure, cause, remote origin/time); after (reference);
Helmut Schmid's TreeTagger with Latin data by Gabriele Brandolini: ab PREP
Lewis & Short, A latin dictionary (1879)
ab, a, ăb, ā, abs, prep. with abl. This IndoEuropean particle (Sanscr. apa or ava, Etr. av, Gr. ὐπό, Goth. af, Old Germ. aba, New Germ. ab, Engl. of, off) has in Latin the following forms: ap, af, ab (av), au-, ā, ă; aps, abs, as-. The (show full text)
Gaffiot, Dictionnaire latin-français (2016, ex 1934), merci à G. Gréco, M. De Wilde, B. Maréchal, K. Ôkubo!
ab ab, v. a 3.
DuCange, Glossarium mediae et infimae latinitatis (1883-7)
AB OLIM, Jam pridem, Gall. Depuis longtemps. Rymer. tom. 8. pag. 348: Ab olim inter recolendae memoriae Dominum Ricardum quondam Regem. Ibidem non semel occurrit.
Latinitatis medii aevi lexicon Bohemorum (thanks to the Centre for Classical Studies at the Institute of Philosophy of the Czech Academy of Sciences (www.ics.cas.cz/en)) (2017)
ab ab v. a