Found 5 Strong's definitions.

1. 1

   G1875: ἐπάν (epán)

   from ἐπί and ἄν; a particle of indefinite contemporaneousness; whenever, as soon as:--when.

   100%
2. 2

   G1909: ἐπί (epí)

   a primary preposition; properly, meaning superimposition (of time, place, order, etc.), as a relation of distribution (with the genitive case), i.e. over, upon, etc.; of rest (with the dative case) at, on, etc.; of direction (with the accusative case) towards, upon, etc.:--about (the times), above, after, against, among, as long as (touching), at, beside, X have charge of, (be-, (where-))fore, in (a place, as much as, the time of, -to), (because) of, (up-)on (behalf of), over, (by, for) the space of, through(-out), (un-)to(-ward), with. In compounds it retains essentially the same import, at, upon, etc. (literally or figuratively).

   1%
3. 3

   G302: ἄν (án)

   a primary particle, denoting a supposition, wish, possibility or uncertainty:--(what-, where-, wither-, who-)soever. Usually unexpressed except by the subjunctive or potential mood. Also contracted for ἐάν.

   1%
4. 4

   G3752: ὅταν (hótan)

   from ὅτε and ἄν; whenever (implying hypothesis or more or less uncertainty); also causatively (conjunctionally) inasmuch as:--as long (soon) as, that, + till, when(-soever), while.

   1%
5. 5

   G3753: ὅτε (hóte)

   from ὅς and τέ; at which (thing) too, i.e. when:--after (that), as soon as, that, when, while.

   1%