a primary preposition denoting union; with or together (but much closer than μετά or παρά), i.e. by association, companionship, process, resemblance, possession, instrumentality, addition, etc.:--beside, with. In composition it has similar applications, including completeness.
from ἐπί and ἵστημι; to stand upon, i.e. be present (in various applications, friendly or otherwise, usually literal); --assault, come (in, to, unto, upon), be at hand (instant), present, stand (before, by, over).
from σύν and ἵστημι (including its collateral forms); to set together, i.e. (by implication) to introduce (favorably), or (figuratively) to exhibit; intransitively, to stand near, or (figuratively) to constitute:--approve, commend, consist, make, stand (with).