What is the meaning of Organizer?

A person who arranges the details of a public event.

A hand-held micro-computer that will perform specific tasks; can be used as an electronic diary, alarm clock, recorder of memos and notes, a portable database etc.

A non-electronic notebook or calendar or something similar, used to organize one's affairs.

A group of cells that, together with the evocator, control differentiation in the embryo; the inductor

first-person singular present passive subjunctive of organizō

Source: wiktionary.org