"A team is a small number of people with complementary skills who are committed to a common purpose, performance goals, and approach for which they are mutually accountable." (Katzenbach and Smith, 1993)
"People working together in a committed way to achieve a common goal or mission. The work is interdependent and team members share responsibility and hold themselves accountable for attaining the results."
"A team is a group of people working together towards a common goal."
"A group in which members work together intensively to achieve a common group goal." (Lewis-McClear & Taylor 1998)