From BiblePortal Wikipedia

Webster's Dictionary [1]

(1): ( adv.) At one time or other hereafter; as, I will do it sometime.

(2): ( a.) Having been formerly; former; late; whilom.

(3): ( adv.) At a past time indefinitely referred to; once; formerly.

(4): ( adv.) At a time undefined; once in a while; now and then; sometimes.

King James Dictionary [2]

SOMETIME, adv. some and time.

1. Once formerly. That fair and warlike form, in which the majesty of buried Denmark did sometime march. 2. At one time or other hereafter. Sometime is really a compound noun, and at is understood before it at some time.

International Standard Bible Encyclopedia [3]

sum´tı̄m  : In modern English means "occasionally," and is so used in   Sirach 37:14 for ἐνίοτε , enı́ote . Otherwise the word means "at some past time," and is the translation of ποτέ , pote . the Revised Version (British and American) changes to "aforetime" in The Wisdom of   Song of Solomon 5:3;  1 Peter 3:20; to "once" in  Ephesians 2:13;  Ephesians 5:8; to "in time past" in  Colossians 1:21; while in  Colossians 3:7 the English Revised Version has "aforetime," the American Standard Revised Version "once." the King James Version does not distinguish between "sometime" and "sometimes."