Source : Webster's Revised Unabridged Dictionary (1913)

Lean \Lean\ (l[=e]n), a. [Compar. {Leaner} (l[=e]n"[~e]r);
   superl. {Leanest}.] [OE. lene, AS. hl[=ae]ne; prob. akin to
   E. lean to incline. See {Lean}, v. i. ]
   1. Wanting flesh; destitute of or deficient in fat; not
      plump; meager; thin; lank; as, a lean body; a lean cattle.

   2. Wanting fullness, richness, sufficiency, or
      productiveness; deficient in quality or contents; slender;
      scant; barren; bare; mean; -- used literally and
      figuratively; as, the lean harvest; a lean purse; a lean
      discourse; lean wages. ``No lean wardrobe.'' --Shak.

            Their lean and fiashy songs.          --Milton.

            What the land is, whether it be fat or lean. --Num.
                                                  xiii. 20.

            Out of my lean and low ability I'll lend you
            something.                            --Shak.

   3. (Typog.) Of a character which prevents the compositor from
      earning the usual wages; -- opposed to {fat}; as, lean
      copy, matter, or type.

   Syn: slender; spare; thin; meager; lank; skinny; gaunt.

Lean \Lean\ (l[=e]n), v. t. [Icel. leyna; akin to G. l["a]ugnen
   to deny, AS. l[=y]gnian, also E. lie to speak falsely.]
   To conceal. [Obs.] --Ray.

Lean \Lean\ (l[=e]n), v. i. [imp. & p. p. {Leaned} (l[=e]nd),
   sometimes {Leant} (l[e^]nt); p. pr. & vb. n. {Leaning}.] [OE.
   lenen, AS. hlinian, hleonian, v. i.; akin to OS. hlin[=o]n,
   D. leunen, OHG. hlin[=e]n, lin[=e]n, G. lehnen, L. inclinare,
   Gr. kli`nein, L. clivus hill, slope. [root]40. Cf.
   {Declivity}, {Climax}, {Incline}, {Ladder}.]
   1. To incline, deviate, or bend, from a vertical position; to
      be in a position thus inclining or deviating; as, she
      leaned out at the window; a leaning column. ``He leant
      forward.'' --Dickens.

   2. To incline in opinion or desire; to conform in conduct; --
      with to, toward, etc.

            They delight rather to lean to their old customs.
                                                  --Spenser.

   3. To rest or rely, for support, comfort, and the like; --
      with on, upon, or against.

            He leaned not on his fathers but himself.
                                                  --Tennyson.

Lean \Lean\, n.
   1. That part of flesh which consist principally of muscle
      without the fat.

            The fat was so white and the lean was so ruddy.
                                                  --Goldsmith.

   2. (Typog.) Unremunerative copy or work.

Lean \Lean\, v. t. [From {Lean}, v. i.; AS. hl[=ae]nan, v. t.,
   fr. hleonian, hlinian, v. i.]
   To cause to lean; to incline; to support or rest. --Mrs.
   Browning.

         His fainting limbs against an oak he leant. --Dryden.

Source : WordNet®

lean
     v 1: to incline or bend from a vertical position; "She leaned
          over the banister" [syn: {tilt}, {tip}, {slant}, {angle}]
     2: cause to lean or incline; "He leaned his rifle against the
        wall"
     3: have a tendency or disposition to do or be something; be
        inclined; "She tends to be nervous before her lectures";
        "These dresses run small"; "He inclined to corpulence"
        [syn: {tend}, {be given}, {incline}, {run}]
     4: rely on for support; "We can lean on this man"
     5: cause to lean to the side; "Erosion listed the old tree"
        [syn: {list}]
     [also: {leant}]

lean
     adj 1: lacking excess flesh; "you can't be too rich or too thin";
            "Yon Cassius has a lean and hungry look"-Shakespeare
            [syn: {thin}] [ant: {fat}]
     2: lacking in mineral content or combustible material; "lean
        ore"; "lean fuel" [ant: {rich}]
     3: containing little excess; "a lean budget"; "a skimpy
        allowance" [syn: {skimpy}]
     4: low in mineral content; "a lean ore"
     5: not profitable or prosperous; "a lean year"
     [also: {leant}]

lean
     n : the property possessed by a line or surface that departs
         from the vertical; "the tower had a pronounced tilt";
         "the ship developed a list to starboard"; "he walked with
         a heavy inclination to the right" [syn: {tilt}, {list}, {inclination},
          {leaning}]
     [also: {leant}]

Source : Free On-Line Dictionary of Computing

Lean
     
        An experimental language from the {University of Nijmegen} and
        {University of East Anglia}, based on graph rewriting and
        useful as an intermediate language.  Lean is descended from
        {Dactl0}.
     
        {Clean} is a subset of Lean.
     
        ["Towards an Intermediate Language Based on Graph Rewriting",
        H.P.  Barendregt et al in PARLE: Parallel Architectures and
        Languages Europe, G. Goos ed, LNCS 259, Springer 1987,
        pp.159-175].
     
        (1995-01-25)