The Collaborative International Dictionary of English v.0.48:

aspartame \aspartame\ n.
   1. an artificial sweetener containing an aspartic acid
      peptide, (C14H18N2O5); it is 160 times sweeter than
      sucrose (cane sugar) and is used as a calorie-free
      sweetener. Chemically it is
      N-L-[alpha]-aspartyl-L-phenylalanine-1-methyl ester. It is
      sold also under the trade name Equal.
      [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Equal \E"qual\, a. [L. aequalis, fr. aequus even, equal; akin to
   Skr. ?ka, and perh. to L. unus for older oinos one, E. one.]
   1. Agreeing in quantity, size, quality, degree, value, etc.;
      having the same magnitude, the same value, the same
      degree, etc.; -- applied to number, degree, quantity, and
      intensity, and to any subject which admits of them;
      neither inferior nor superior, greater nor less, better
      nor worse; corresponding; alike; as, equal quantities of
      land, water, etc.; houses of equal size; persons of equal
      stature or talents; commodities of equal value.
      [1913 Webster]

   2. Bearing a suitable relation; of just proportion; having
      competent power, abilities, or means; adequate; as, he is
      not equal to the task.
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            The Scots trusted not their own numbers as equal to
            fight with the English.               --Clarendon.
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            It is not permitted to me to make my commendations
            equal to your merit.                  --Dryden.
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            Whose voice an equal messenger
            Conveyed thy meaning mild.            --Emerson.
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   3. Not variable; equable; uniform; even; as, an equal
      movement. "An equal temper." --Dryden.
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   4. Evenly balanced; not unduly inclining to either side;
      characterized by fairness; unbiased; impartial; equitable;
      just.
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            Are not my ways equal?                --Ezek. xviii.
                                                  29.
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            Thee, O Jove, no equal judge I deem.  --Spenser.
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            Nor think it equal to answer deliberate reason with
            sudden heat and noise.                --Milton.
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   5. Of the same interest or concern; indifferent.
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            They who are not disposed to receive them may let
            them alone or reject them; it is equal to me.
                                                  --Cheyne.
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   6. (Mus.) Intended for voices of one kind only, either all
      male or all female; -- opposed to mixed. [R.]
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   7. (Math.) Exactly agreeing with respect to quantity.
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   Equal temperament. (Mus.) See Temperament.

   Syn: Even; equable; uniform; adequate; proportionate;
        commensurate; fair; just; equitable.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Equal \E"qual\, n.
   1. One not inferior or superior to another; one having the
      same or a similar age, rank, station, office, talents,
      strength, or other quality or condition; an equal quantity
      or number; as, "If equals be taken from equals the
      remainders are equal."
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            Those who were once his equals envy and defame him.
                                                  --Addison.
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   2. State of being equal; equality. [Obs.] --Spenser.
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The Collaborative International Dictionary of English v.0.48:

Equal \E"qual\, v. t. [imp. & p. p. Equaledor Equalled; p.
   pr. & vb. n. Equaling or Equalling.]
   1. To be or become equal to; to have the same quantity, the
      same value, the same degree or rank, or the like, with; to
      be commen?urate with.
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            On me whose all not equals Edward's moiety. --Shak.
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   2. To make equal return to; to recompense fully.
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            Who answered all her cares, and equaled all her
            love.                                 --Dryden.
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   3. To make equal or equal to; to equalize; hence, to compare
      or regard as equals; to put on equality.
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            He would not equal the mind that he found in himself
            to the infinite and incomprehensible. --Berkeley.
      [1913 Webster]

WordNet (r) 3.0 (2006):

equal
    adj 1: having the same quantity, value, or measure as another;
           "on equal terms"; "all men are equal before the law"
           [ant: unequal]
    2: having the requisite qualities or resources to meet a task;
       "she had adequate training"; "her training was adequate";
       "she was adequate to the job"; "he was equal to the task"
       [syn: adequate, equal] [ant: inadequate, unequal]
    n 1: a person who is of equal standing with another in a group
         [syn: peer, equal, match, compeer]
    v 1: be identical or equivalent to; "One dollar equals 1,000
         rubles these days!" [syn: equal, be] [ant: differ]
    2: be equal to in quality or ability; "Nothing can rival cotton
       for durability"; "Your performance doesn't even touch that of
       your colleagues"; "Her persistence and ambition only matches
       that of her parents" [syn: equal, touch, rival,
       match]
    3: make equal, uniform, corresponding, or matching; "let's
       equalize the duties among all employees in this office"; "The
       company matched the discount policy of its competitors" [syn:
       equal, match, equalize, equalise, equate]

Moby Thesaurus II by Grady Ward, 1.0:

271 Moby Thesaurus words for "equal":
   accord, accordant, agent, agree, aligned, alike, alter ego,
   alternate, alternative, amount to, analogous, analogy, approach,
   at par, au pair, automatic, backup, balance, balanced, be parallel,
   beat, break even, brother, capable of, challenge comparison,
   change, changeable, changeling, coequal, coextend, coextending,
   coextensive, coincident, coincidental, coinciding, collateral,
   colleague, come to, come up to, commensurable, commensurate,
   commutable, commutative, comparable, compare, comparison, compeer,
   competitor, concurrent, congruent, congruous, consistent,
   consonant, constant, continuous, convertible, coordinate, copy,
   correspond, correspond to, correspondent, corresponding,
   coterminous, counterfeit, counterpart, deputy, dispassionate,
   distributional, distributive, ditto, double, draw, drawn, dummy,
   duplicate, emulate, equable, equal to, equalize, equalized,
   equalizing, equidistant, equilateral, equipollent, equispaced,
   equitable, equivalent, ersatz, eurythmic, even, even off,
   even stephen, exchange, exchanged, fair, fake, fellow, fifty-fifty,
   fill-in, finished, flat, ghost, ghostwriter, give-and-take,
   go alongside, go beside, half, half-and-half, halvers, harmonious,
   homogeneous, identic, identical, imitation, immutable, impartial,
   indistinguishable, interchangeable, interchanged, invariable, just,
   keep pace with, knot, knotted, level, like, lined up, locum tenens,
   makeshift, match, match up with, matching, mate, measure up,
   measure up to, measured, mechanical, meet, metaphor, methodic,
   metonymy, monolithic, mutual, next best thing, nip and tuck,
   nonconvergent, nondivergent, objective, of a piece, on a footing,
   on a level, on a par, on even ground, opposite number, ordered,
   orderly, par, parallel, parallelepipedal, parallelinervate,
   paralleling, parallelodrome, parallelogrammatic, parallelogrammic,
   parallelotropic, partake of, particular, peer, per capita,
   per head, permutable, persistent, personnel, phony, pinch hitter,
   pro rata, proportional, proportionate, proportioned, prorated,
   proxy, quits, reach, reciprocal, reciprocating, reciprocative,
   regular, relief, replacement, representative, reserves, respective,
   retaliatory, returnable, ringer, rival, robotlike, run abreast,
   run parallel, run to, second string, secondary, selfsame, several,
   sign, similar, smooth, spares, square, square with, stable,
   stack up with, stalemated, stand-in, standard, steadfast, steady,
   sub, substituent, substitute, substitution, succedaneum,
   superseder, supplanter, surrogate, swapped, switched, symbol,
   symmetric, symmetrical, synecdoche, synonymous, systematic, tally,
   tally with, tantamount, third string, tie, tied, token, top, touch,
   traded, transposed, twin, unbiased, unbroken, unchangeable,
   unchanged, unchanging, uncolored, understudy, undeviating,
   undifferentiated, undiversified, uniform, unprejudiced, unruffled,
   unvaried, unvarying, up to, utility player, vicar, vice-president,
   vice-regent, vie, vie with, well-balanced, well-set, well-set-up,
   without distinction