The story
Derived by analogy with the kick-off that begins each playing period in soccer, American football, and rugby.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: The first official meeting of a group of people who will be working together on a project. The agenda will usually include introductions, statement(s) of mission, and organization of teams or working-groups. The implication is that there will be more meetings to follow. Full definition →
Derived by analogy with the kick-off that begins each playing period in soccer, American football, and rugby.
Etymology from Wiktionary, CC BY-SA 4.0.