Source : Webster's Revised Unabridged Dictionary (1913)

Neo-Lamarckism \Ne`o-La*marck"ism\, n. (Biol.)
   Lamarckism as revived, modified, and expounded by recent
   biologists, esp. as maintaining that the offspring inherits
   characters acquired by the parent from change of environment,
   use or disuse of parts, etc.; -- opposed of {Neo-Darwinism}
   (which see, above). -- {Ne`o-La*marck"i*an}, a. & n.

Source : WordNet®

Neo-Lamarckism
     n : a modern Lamarckian theory emphasizing the importance of
         environmental factors in genetic changes and retaining
         the notion of the inheritance of acquired characters