ἐπὶ [138 verses](prep) "On" is from epi, which means "on," "upon," "at," "by," "before," "across," "for," and "against." With a noun in the possessive, genitive, it means "upon," "on" but not necessarily of Place, "by (of persons)," "deep (with numbers)," "in the presence of," "towards," "in the time of," and "over (referring to a person of authority)." With a noun indirect object, dative, it means of place: "upon," "on," or "over," of people: "against (in a hostile sense)," regarding a situation: "towards" or "in reference to," of an accumulation: "upon," "after," "addition to," and "besides," of position: "after," "behind," "in dependence upon," and "in the power of," of time: "by," and "after," and. in a causal sense: "of the occasion or cause," "for" a person, an end, or purpose," "on condition that," and "for" (a price).  With the objective noun, an accusative, it means of place: "upon or on to a height," "up to," "as far as," "a little way," "a little," "towards," "to," in hostile sense: "against," of extension: "over," "over (a space)," of time: "for," "during," "up to" or "till," in a causal sense: "of (the object)," for (this purpose)," "as regards,"after," "according to," and "by (this cause)." With verbs of perceiving, observing, and judging, it means "in the case of." -- The word translated as "unto" means "on," "over," "upon," "for,"  "against," "before," "after," "during," "by" "in the case of."