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

only \on"ly\, conj.
   save or except that; -- an adversative used elliptically
   with or without that, and properly introducing a single fact
   or consideration.
   1913 webster

         he might have seemed some secretary or clerk . . . only
         that his low, flat, unadorned cap . . . indicated that
         he belonged to the city.                 --sir w.
                                                  scott.
   1913 webster

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

only \on"ly\, a. oe. only, anly, onlich, as. =anlic, i.e.,
   onelike. see one, and like, a.
   1. one alone; single; as, the only man present; his only
      occupation.
      1913 webster

   2. alone in its class; by itself; not associated with others
      of the same class or kind; as, an only child.
      1913 webster

   3. hence, figuratively: alone, by reason of superiority;
      preeminent; chief. "motley's the only wear." --shak.
      1913 webster
see also:
one and like 

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

only \on"ly\, adv. see only, a.
   1. in one manner or degree; for one purpose alone; simply;
      merely; barely.
      1913 webster

            and to be loved himself, needs only to be known.
      --dryden.
      1913 webster

   2. so and no otherwise; no other than; exclusively; solely;
      wholly. "she being only wicked." --beau.  fl.
      1913 webster

            every imagination . . . of his heart was only evil.
                                                  --gen. vi. 5.
      1913 webster

   3. singly; without more; as, only-begotten.
      1913 webster

   4. above all others; particularly. obs.
      1913 webster

            his most only elected mistress.       --marston.
      1913 webster
see also:
only 

[4] : WordNet (r) 2.0

only
     adj 1: being the only one; single and isolated from others; "the
            lone doctor in the entire county"; "a lonesome pine";
            "an only child"; "the sole heir"; "the sole example";
            "a solitary instance of cowardice"; "a solitary speck
            in the sky" syn: lonea, lonesomea, onlya,
             solea, solitarya
     2: 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
     adv 1: and nothing more; "i was merely asking"; "it is simply a
            matter of time"; "just a scratch"; "he was only a
            child"; "hopes that last but a moment" syn: merely,
             simply, just, but
     2: 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, alone
     3: with nevertheless the final result; "he arrived only to find
        his wife dead"; "we won only to lose again in the next
        round"
     4: in the final outcome; "these news will only make you more
        upset"
     5: except that; "it was the same story; only this time she came
        out better"
     6: never except when; "call me only if your cold gets worse"
        syn: only if, only when
     7: as recently as; "i spoke to him only an hour ago"
see also:
lonea lonesomea onlya solea solitarya alonep 
merely simply just but entirely 
exclusively solely alone only if only when 

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

95 moby thesaurus words for "only":
   absolute, after a fashion, alone, appreciably, at any rate,
   at best, at least, at most, at the least, at the most,
   at the outside, at worst, azygous, barely, but, celibate,
   companionless, comparatively, contrariwise, detectably, entirely,
   exclusive, exclusively, fairly, first and last, however, impair,
   in a manner, in a way, in part, in some measure, incomparable,
   incompletely, inimitable, integrally, irreducibly, just, leastwise,
   lone, matchless, merely, mildly, moderately, modestly,
   not comprehensively, not exhaustively, odd, on the contrary, one,
   one and only, only-begotten, part, partially, particular, partly,
   peerless, plainly, pro tanto, purely, relatively, separate, simply,
   simply and solely, single, singly, singular, so far, sole, solely,
   solitary, solo, somewhat, thus far, to a degree, to some degree,
   tolerably, totally, transcendent, unaccompanied, unanalyzably,
   unattended, undividedly, unequaled, unexampled, unique, unmatched,
   unpaired, unparagoned, unparalleled, unrepeatable, unrepeated,
   unrivaled, visibly, wholly, yet

[6] : U.S. Gazetteer (1990)

only, tn
  zip codes: 37140

Only >> O Words
Only, definition of term: Only
only_pag1.html

Only When >> O Words
Only When, definition of term: Only When
only+when_pag1.html

Not Only >> N Words
Not Only, definition of term: Not Only
not+only_pag1.html