The Collaborative International Dictionary of English v.0.48:

Less \Less\, v. t.
   To make less; to lessen. [Obs.] --Gower.
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The Collaborative International Dictionary of English v.0.48:

Less \Less\ (l[e^]s), conj.
   Unless. [Obs.] --B. Jonson.
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The Collaborative International Dictionary of English v.0.48:

Less \Less\, a. [OE. lesse, AS. l[=ae]ssa; akin to OFries.
   l[=e]ssa; a compar. from a lost positive form. Cf. Lesser,
   Lest, Least. Less has the sense of the comparative degree
   of little.]
   Smaller; not so large or great; not so much; shorter;
   inferior; as, a less quantity or number; a horse of less size
   or value; in less time than before.
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   Note: The substantive which less qualifies is often omitted;
         as, the purse contained less (money) than ten dollars.
         See Less, n.
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               Thus in less [time] than a hundred years from the
               coming of Augustine, all England became
               Christian.                         --E. A.
                                                  Freeman.
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The Collaborative International Dictionary of English v.0.48:

Less \Less\, adv. [AS. l[=ae]s. See Less, adj., and cf.
   Lest.]
   Not so much; in a smaller or lower degree; as, less bright or
   loud; less beautiful.
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The Collaborative International Dictionary of English v.0.48:

Less \Less\, n.
   1. A smaller portion or quantity.
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            The children of Israel did so, and gathered, some
            more, some less.                      --Ex. xvi. 17.
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   2. The inferior, younger, or smaller.
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            The less is blessed of the better.    --Heb. vii. 7.
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The Collaborative International Dictionary of English v.0.48:

-less \-less\ (-l[e^]s) suff. [AS. le['a]s loose, false; akin to
   OS. l[=o]s loose, false, D. los loose, loos false, sly, G.
   los loose, Icel. lauss loose, vacant, Goth. laus empty, vain,
   and also to E. loose, lose. [root]127. See Lose, and cf.
   Loose, Leasing.]
   A privative adjective suffix, denoting without, destitute of,
   not having; as witless, childless, fatherless.
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WordNet (r) 3.0 (2006):

less
    adv 1: used to form the comparative of some adjectives and
           adverbs; "less interesting"; "less expensive"; "less
           quickly" [syn: less, to a lesser extent] [ant:
           more, to a greater extent]
    2: comparative of little; "she walks less than she should"; "he
       works less these days" [ant: more]
    adj 1: (comparative of `little' usually used with mass nouns) a
           quantifier meaning not as great in amount or degree; "of
           less importance"; "less time to spend with the family";
           "a shower uses less water"; "less than three years old"
           [ant: more than, more(a)]
    2: (usually preceded by `no') lower in quality; "no less than
       perfect"
    3: (nonstandard in some uses but often idiomatic with measure
       phrases) fewer; "less than three weeks"; "no less than 50
       people attended"; "in 25 words or less"