The Collaborative International Dictionary of English v.0.48:

Teamwork \Team"work`\, n.
   1. Work done by a team, as distinguished from that done by
      personal labor.
      [1913 Webster]

   2. Work done by a number of associates, usually each doing a
      clearly defined portion, but all subordinating personal
      prominence to the efficiency of the whole; as, the
      teamwork of a football eleven or a gun crew.
      [Webster 1913 Suppl.]

            Is the teamwork system employed, or does one workman
            make the whole cigar?                 --U. S.
                                                  Consular
                                                  Repts.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

teamwork
    n 1: cooperative work done by a team (especially when it is
         effective); "it will take money, good planning and, above
         all, teamwork"

The Free On-line Dictionary of Computing (19 January 2023):

Teamwork

    A SASD tool from Sterling
   Software, formerly CADRE Technologies, which supports the
   Shlaer/Mellor Object-Oriented method and the
   Yourdon-DeMarco, Hatley-Pirbhai, Constantine and Buhr
   notations.

   Teamwork was abandoned when Computer Associates
   acquired Sterling Software in March 2000.

   (2002-05-29)