The Collaborative International Dictionary of English v.0.48:

Alike \A*like"\ ([.a]*l[imac]k), a. [AS. onl[imac]c, gel[imac]c;
   pref. [=a] + like.]
   Having resemblance or similitude; similar; without
   difference. [Now used only predicatively.]
   [1913 Webster]

         The darkness and the light are both alike to thee.
                                                  --Ps. cxxxix.
                                                  12.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Alike \A*like"\, adv. [AS. gel[imac]ce, onl[imac]ce.]
   In the same manner, form, or degree; in common; equally; as,
   we are all alike concerned in religion.
   [1913 Webster]

WordNet (r) 3.0 (2006):

alike
    adv 1: equally; "parents and teachers alike demanded reforms"
           [syn: alike, likewise]
    2: in a like manner; "they walk alike"
    adj 1: having the same or similar characteristics; "all
           politicians are alike"; "they looked utterly alike";
           "friends are generally alike in background and taste"
           [syn: alike(p), similar, like] [ant: dissimilar,
           unalike]

Moby Thesaurus II by Grady Ward, 1.0:

138 Moby Thesaurus words for "alike":
   accordant, akin, all one, all the same, analogous, aped, as is,
   at par, au pair, automatic, balanced, coequally, coextensively,
   coincidentally, commensurate, comparable, congruently, consimilar,
   consistent, consonant, constant, consubstantial, continuous,
   copied, correspondent, correspondently, corresponding,
   correspondingly, coterminously, counterfeit, ditto, drawn,
   duplicate, equable, equal, equalized, equally, ersatz, even,
   even stephen, exactly alike, fake, favoring, fifty-fifty, flat,
   following, half-and-half, homogeneous, homoousian, ibid, ibidem,
   identic, identical, identically, imitated, imitation, immutable,
   in like manner, indiscernible, indistinct, indistinctive,
   indistinguishable, interchangeable, invariable, just alike,
   just the same, knotted, level, like, likewise, measured,
   mechanical, methodic, mimicked, mock, monolithic,
   nearly reproduced, nip and tuck, not unlike, of a piece,
   on a footing, on a level, on a par, on even ground, one, ordered,
   orderly, par, parallel, persistent, phony, proportionate, quits,
   regular, resembling, robotlike, same, same here, selfsame, similar,
   similarly, simulated, smacking of, smooth, something like, square,
   stable, stalemated, standard, steadfast, steady, stereotyped,
   suggestive of, synonymously, synthetic, systematic, the same way,
   tied, twin, unbroken, unchangeable, unchanged, unchanging,
   undeviating, undifferent, undifferentiated, undiscriminated,
   undistinguishable, undistinguished, undiversified, uniform,
   uniform with, uniformly, unruffled, unvaried, unvarying,
   without difference, without distinction