[1] : The Collaborative International Dictionary of English v.0.48

alone \alone"\, a. all + one. oe. al one all allone, as. =an
   one, alone. see all, one, lone.
   1. quite by one's self; apart from, or exclusive of, others;
      single; solitary; -- applied to a person or thing.
      1913 webster

            alone on a wide, wide sea.            --coleridge.
      1913 webster

            it is not good that the man should be alone. --gen.
                                                  ii. 18.
      1913 webster

   2. of or by itself; by themselves; without any thing more or
      any one else; without a sharer; only.
      1913 webster

            man shall not live by bread alone.    --luke iv. 4.
      1913 webster

            the citizens alone should be at the expense.
                                                  --franklin.
      1913 webster

   3. sole; only; exclusive. r.
      1913 webster

            god, by whose alone power and conversation we all
            live, and move, and have our being.   --bentley.
      1913 webster

   4. hence; unique; rare; matchless. --shak.
      1913 webster

   note: the adjective alone commonly follows its noun.
         1913 webster

   to let alone or to leave alone, to abstain from
      interfering with or molesting; to suffer to remain in its
      present state.
      1913 webster
see also:
all one lone to let alone to leave alone 

[2] : The Collaborative International Dictionary of English v.0.48

alone \alone"\, adv.
   solely; simply; exclusively.
   1913 webster

[3] : WordNet (r) 2.0

alone
     adj 1: isolated from others; "could be alone in a crowded room";
            "was alone with her thoughts"; "i want to be alone"
            syn: alonep
     2: lacking companions or companionship; "he was alone when we
        met him"; "she is alone much of the time"; "the lone skier
        on the mountain"; "a lonely fisherman stood on a tuft of
        gravel"; "a lonely soul"; "a solitary traveler" syn: alonep,
         lonea, lonelya, solitary
     3: exclusive of anyone or anything else; "she alone believed
        him"; "cannot live by bread alone"; "i'll have this car
        and this car only" syn: alonep, only
     4: radically distinctive and without equal; "he is alone in the
        field of microbiology"; "this theory is altogether alone
        in its penetration of the problem"; "bach was unique in
        his handling of counterpoint"; "craftsmen whose skill is
        unequaled"; "unparalleled athletic ability"; "a breakdown
        of law unparalleled in our history" syn: alonep, unique,
         unequaled, unequalled, unparalleled
     adv 1: without any others being included or involved; "was entirely
            to blame"; "a school devoted entirely to the needs of
            problem children"; "he works for mr. smith
            exclusively"; "did it solely for money"; "the burden
            of proof rests on the prosecution alone"; "a privilege
            granted only to him" syn: entirely, exclusively,
            solely, only
     2: without anybody else; "the child stayed home alone"; "he
        flew solo" syn: solo, unaccompanied
see also:
alonep lonea lonelya solitary only unique 
unequaled unequalled unparalleled entirely exclusively 
solely solo unaccompanied 

[4] : Moby Thesaurus II by Grady Ward, 1.0

95 moby thesaurus words for "alone":
   abandoned, absolute, alienated, all alone, aloof, apart, azygous,
   barely, but, by itself, celibate, companionless, deserted,
   desolate, detached, entirely, excellent, exclusively,
   first and last, friendless, good, homeless, impair, in solitude,
   in the singular, incomparable, independently, individually,
   inimitable, insular, isolate, isolated, just, kithless, lone,
   lonely, lonesome, matchless, merely, odd, once, one and only,
   one by one, only, only-begotten, out-of-the-way, particularly,
   peerless, per se, plainly, private, purely, remote, removed,
   retired, rootless, secluded, second to none, separate, separated,
   separately, severally, simply, simply and solely, single-handed,
   single-handedly, singly, singular, singularly, sole, solely,
   solitary, solo, superior, unabetted, unaccompanied, unaided,
   unassisted, unattended, unequaled, unescorted, unexampled,
   unexcelled, unique, unmatched, unpaired, unparalleled,
   unrepeatable, unrepeated, unrivaled, unseconded, unsupported,
   unsurpassed, withdrawn, without equal

[5] : THE DEVIL'S DICTIONARY ((C)1911 Released April 15 1993)

alone, adj.  in bad company.

    in contact, lo the flint and steel,
    by spark and flame, the thought reveal
    that he the metal, she the stone,
    had cherished secretly alone.
                                                           booley fito

Alone >> A Words
Alone, definition of term: Alone
alone_pag1.html

Let Alone >> L Words
Let Alone, definition of term: Let Alone
let+alone_pag1.html