Meaning
Either <1,,2228, e>
is a disjunctive particle. One of its uses is to distinguish things which exclude each other, or one of which can take the place of another. It is translated "either" in Mat 6:24, Mat 12:33, Luk 16:13, Act 17:21, 1Co 14:6. The RV rightly omits it in Luk 6:42, and translates it by "or" in Luk 15:8, Phi 3:12, Jam 3:12.
Note: The adverb enteuthen, denoting "hence," is repeated in the phrase rendered "on either side," (lit., "hence and hence") in Joh 19:18. The RV of Rev 22:2 translates it "on this side," distinguishing it from ekeithen, "on that side;" the AV, following another reading for the latter adverb, has "on either side." See HENCE.
