Jimmy Akin has a fascinating series on the 'original' meaning of the theological term known as the "elect". Over the centuries since the time of the Apostles, the term has come to mean something along the lines of "those predestined for Heaven," those who cannot lose their salvation, those chosen unconditionally, etc. But since this isn't the 'original' Biblical meaning, I think this is an unfortunate case of misusing key Biblical terminology and thus should be corrected. Catholicism has no problem with theology developing in a manner in which no Dogma or Divine Revelation is undermined, but really we should try to stick with the original understandings of key Biblical terms. I think this is especially crucial when it comes to reading the Bible, so we know what is being said rather than projecting our own assumptions immediately onto the text. And with that, I will dive right into Jimmy's three 11/17 articles (and will update this post when he makes a fourth), summarizing what he said, and I encourage you to read them yourself.
Jimmy begins with looking into the Epistle of 1 Clement, which is a good place to start, because it shows what the earliest Christians thought about certain key terms. This Epistle is traditionally attributed to St Clement, one of the earliest Popes, and personal friend of Peter and Paul (Philippians 4:3), and there is no good reason to doubt this. The Epistle is staid to have been written around AD96, but Jimmy says it could be even as early as AD70.