GOVERNMENT CODE, 54952.6

As used in this chapter, "action taken" means a collective decision made by a majority of the members of a legislative body, a collective commitment or promise by a majority of the members of a legislative body, a collective commitment or promise by a majority of the members of a legislative  body to make a positive or a negative decision, or an actual vote by a majority of the members of a legislative body when sitting as a body or entity, upon a motion, proposal, resolution, order, or ordinance.

A quorum is needed to take an action