The Collaborative International Dictionary of English v.0.48:

Sometime \Some"time`\ (s[u^]m"t[imac]m`), a.
   Having been formerly; former; late; whilom.
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         Our sometime sister, now our queen.      --Shak.
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         Ion, our sometime darling, whom we prized. --Talfourd.
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The Collaborative International Dictionary of English v.0.48:

Sometime \Some"time`\, adv.
   1. At a past time indefinitely referred to; once; formerly.
      [1913 Webster]

            Did they not sometime cry "All hail" to me? --Shak.
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   2. At a time undefined; once in a while; now and then;
      sometimes.
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            Sometime we see a cloud that's dragonish,
            A vapor sometime like a bear or lion. --Shak.
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   3. At one time or other hereafter; as, I will do it sometime.
      "Sometime he reckon shall." --Chaucer.
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WordNet (r) 3.0 (2006):

sometime
    adv 1: at some indefinite or unstated time; "let's get together
           sometime"; "everything has to end sometime"; "It was to
           be printed sometime later"
    adj 1: belonging to some prior time; "erstwhile friend"; "our
           former glory"; "the once capital of the state"; "her
           quondam lover" [syn: erstwhile(a), former(a), old,
           onetime(a), one-time(a), quondam(a), sometime(a)]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "sometime":
   ancient, any time, before long, by and by, bygone, early,
   erstwhile, eventually, finally, fore, former, immemorial,
   in due time, late, old, olden, once, one day, one fine day,
   one fine morning, onetime, past, prehistoric, previous, primeval,
   primitive, prior, quondam, recent, some fine day, some sweet day,
   someday, somewhen, soon, sooner or later, then, ultimately, whilom,
   yet