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

lesser \less"er\, adv.
   less. obs. --shak.
   1913 webster

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

lesser \less"er\ le^s"~er, a. this word is formed by
   adding anew the compar. suffix -er in which r is from an
   original s to less. see less, a.
   less; smaller; inferior.
   1913 webster

         god made . . . the lesser light to rule the night.
                                                  --gen. i. 15.
   1913 webster

   note: lesser is used for less, now the compar. of little, in
         certain special instances in which its employment has
         become established by custom; as, lesser asia i. e.,
         asia minor, the lesser light, and some others; also in
         poetry, for the sake of the meter, and in prose where
         its use renders the passage more euphonious.
         1913 webster

               the more my prayer, the lesser is my grace.
                                                  --shak.
         1913 webster

               the larger here, and there the lesser lambs.
                                                  --pope.
         1913 webster

               by the same reason may a man, in the state of
               nature, punish the lesser breaches of the law.
                                                  --locke.
         1913 webster
see also:
less 

[3] : WordNet (r) 2.0

lesser
     adj 1: of less size or importance; "the lesser anteater"; "the
            lesser of two evils" ant: greater
     2: smaller in size or amount or value; "the lesser powers of
        europe"; "the lesser anteater"
see also:
greater 

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

64 moby thesaurus words for "lesser":
   abated, ablated, attenuated, bated, belittled, common, consumed,
   contracted, curtailed, decreased, deflated, demeaning, diminished,
   dinky, disadvantaged, dissipated, dropped, eroded, fallen, humble,
   in the shade, inferior, infra dig, insignificant, junior, less,
   low, lower, lowered, lowly, miniaturized, minor, modest, nether,
   ordinary, reduced, retrenched, scaled-down, second rank,
   second string, secondary, servile, shorn, shorter, shrunk,
   shrunken, small, small-fry, small-time, smaller, sub, subaltern,
   subjacent, subject, subordinate, subservient, third rank,
   third string, under, underprivileged, vulgar, watered-down,
   weakened, worn

Lesser >> L Words
Lesser, definition of term: Lesser
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Lesser Bear >> L Words
Lesser Bear, definition of term: Lesser Bear
lesser+bear_pag1.html