In my reading of works from Catholic scholars, I come across a lot of Latin, and have discovered two excellent resources for definitions.

One is “Consecrated Phrases: A Latin Theological Dictionary” available from Amazon at http://www.amazon.com/Consecrated-Phrases-Theological-Dictionary-Expressions/dp/0814682146/ref=sr_1_1?ie=UTF8&qid=1426098076&sr=8-1&keywords=Consecrated+Phrases%3A+A+Latin+Theological+Dictionary,

The other is the standard “Cassells’ Latin Dictionary”, from Amazon at http://www.amazon.com/Cassells-Standard-Latin-Dictionary-Thumb-indexed/dp/0025225804/ref=sr_1_1?ie=UTF8&qid=1426098205&sr=8-1&keywords=Cassells%E2%80%99+Latin+Dictionary