cooperative work done by a team (especially when it is effective)
It will take money, good planning and, above all, teamwork.
source: WordNet 3.0
Work done by a team, as distinguished from that done by personal labor.
source: Webster 1913
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.