The Collaborative International Dictionary of English v.0.48:

improved \improved\ adj.
   1. advanced to a more desirable or valuable or excellent
      state. Opposite of unimproved. [Narrower terms: built,
      reinforced; cleared, tilled ; {developed; grade ;
      {graded, graveled ] Also See: {restored.
      [WordNet 1.5]

   2. changed for the better; as, her improved behavior.

   Syn: amended.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Develop \De*vel"op\ (d[-e]*v[e^]l"[o^]p), v. t. [imp. & p. p.
   Developed; p. pr. & vb. n. Developing.] [F. d['e]veloper;
   d['e]- (L. dis-) + OF. voluper, voleper, to envelop, perh.
   from L. volup agreeably, delightfully, and hence orig., to
   make agreeable or comfortable by enveloping, to keep snug
   (cf. Voluptuous); or. perh. fr. a derivative of volvere,
   volutum, to roll (cf. Devolve). Cf. Envelop.] [Written
   also develope.]
   1. To free from that which infolds or envelops; to unfold; to
      lay open by degrees or in detail; to make visible or
      known; to disclose; to produce or give forth; as, to
      develop theories; a motor that develops 100 horse power.
      [1913 Webster]

            These serve to develop its tenets.    --Milner.
      [1913 Webster]

            The 20th was spent in strengthening our position and
            developing the line of the enemy.     --The Century.
      [1913 Webster]

   2. To unfold gradually, as a flower from a bud; hence, to
      bring through a succession of states or stages, each of
      which is preparatory to the next; to form or expand by a
      process of growth; to cause to change gradually from an
      embryo, or a lower state, to a higher state or form of
      being; as, sunshine and rain develop the bud into a
      flower; to develop the mind.
      [1913 Webster]

            The sound developed itself into a real compound.
                                                  --J. Peile.
      [1913 Webster]

            All insects . . . acquire the jointed legs before
            the wings are fully developed.        --Owen.
      [1913 Webster]

   3. To advance; to further; to prefect; to make to increase;
      to promote the growth of.
      [1913 Webster]

            We must develop our own resources to the utmost.
                                                  --Jowett
                                                  (Thucyd).
      [1913 Webster]

   4. (Math.) To change the form of, as of an algebraic
      expression, by executing certain indicated operations
      without changing the value.
      [1913 Webster]

   5. (Photog.) To cause to become visible, as an invisible or
      latent image upon plate, by submitting it to chemical
      agents; to bring to view.
      [1913 Webster]

   To develop a curved surface on a plane (Geom.), to produce
      on the plane an equivalent surface, as if by rolling the
      curved surface so that all parts shall successively touch
      the plane.

   Syn: To uncover; unfold; evolve; promote; project; lay open;
        disclose; exhibit; unravel; disentangle.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

developed \developed\ adj.
   1. being changed over time so as to be e.g. stronger or more
      complete or more useful; as, the developed qualities of
      the Hellenic outlook; the state's well-developed
      industries. Oppositre of undeveloped. [Narrower terms:
      formulated; mature]
      [WordNet 1.5]

   2. made more useful and profitable as by building or laying
      out roads; -- of real estate. new houses are springing up
      on the developed tract of land near the river

   Syn: improved.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

developed
    adj 1: being changed over time so as to be e.g. stronger or more
           complete or more useful; "the developed qualities of the
           Hellenic outlook"; "they have very small limbs with only
           two fully developed toes on each" [ant: undeveloped]
    2: (used of societies) having high industrial development;
       "developed countries" [syn: developed, highly-developed]
    3: (of real estate) made more useful and profitable as by
       building or laying out roads; "condominiums were built on the
       developed site"