Extra—beyond; as, extra-ordinary, beyond what is ordinary.
In, im, il, ir—(in, Gothic, inna, a cave or cell;) as, in-fuse, to pour in. These prefixes, when incorporated with adjectives or nouns, commonly reverse their meaning; as, in-sufficient, im-polite, il-legitimate, ir-reverence, ir-resolute.
Inter—between; as, inter-pose, to put between.
Intro—within, into; intro-vert, to turn within; intro-duce, to lead into.
Ob, op—denote opposition; as, ob-ject, to bring against; op-pugn, to oppose.
Per—through, by; as, per-ambulate, to walk through; per-haps, by haps.
Post—after; as, post-script, written after; post-fix, placed after.
Præ, pre—before; as, pre-fix, to fix before.
Pro—for, forth, forward; as, pro-noun, for a noun; pro-tend, to stretch forth; pro-ject, to shoot forward.
Præter—past, beyond; as, preter-perfect, pastperfect; preter-natural, beyond the course of nature.