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
pros (Greek #4314)
a preposition of direction; forward to, i.e. toward (with the genitive case, the side of, i.e. pertaining to; with the dative case, by the side of, i.e. near to; usually with the accusative case, the place, time, occasion, or respect, which is the destination of the relation, i.e. whither or for which it is predicated)
KJV usage: about, according to , against, among, at, because of, before, between, (where-)by, for, X at thy house, in, for intent, nigh unto, of, which pertain to, that, to (the end that), X together, to (you) -ward, unto, with(-in). In the comparative case, it denotes essentially the same applications, namely, motion towards, accession to, or nearness at.
Pronounce: pros
Origin: a strengthened form of 4253