What is the meaning of the word "club"?

Definitions:

a building that is occupied by a social club noun
- the clubhouse needed a new roof
a formal association of people with similar interests noun
- I joined a golf club.
a playing card in the minor suit that has one or more black trefoils on it noun
- I led a small club.
a team of professional baseball players who play and travel together noun
- each club played six home games with teams in its own division
stout stick that is larger at one end noun
- I carried a club in self defense.
to gather and spend time together verb
- They always club together.
to gather into a club-like mass verb
- club hair
to strike with a club or a bludgeon verb
- The police clubbed the protesters.
to unite with a common purpose verb
- The two clubbed together to go against a common enemy.