dia (Greek #1223)
through (in very wide applications, local, causal, or occasional)
KJV usage: after, always, among, at, to avoid, because of (that), briefly, by, for (cause) ... fore, from, in, by occasion of, of, by reason of, for sake, that, thereby, therefore, X though, through(-out), to, wherefore, with (-in). In composition it retains the same general importance.
Pronounce: dee-ah'
Origin: a primary preposition denoting the channel of an act
ara (Greek #686)
a particle denoting an inference more or less decisive (as follows)
KJV usage: haply, (what) manner (of man), no doubt, perhaps, so be, then, therefore, truly, wherefore. Often used in connection with other particles, especially 1065 or 3767 (after) or 1487 (before). Compare also 687.
Pronounce: ar'-ah
Origin: probably from 142 (through the idea of drawing a conclusion)
oun (Greek #3767)
(adverbially) certainly, or (conjunctionally) accordingly
KJV usage: and (so, truly), but, now (then), so (likewise then), then, therefore, verily, wherefore.
Pronounce: oon
Origin: apparently a primary word