<p><strong>Noun</strong></p><ul><li>A person who organizes, especially one who forms and organizes a group.</li><li>A person whose job is to enlist employees into membership in a union.</li><li>A person who organizes or schedules work: You would get this job done sooner if you were a better organizer.</li><li>A multiple folder or, sometimes, a notebook in which correspondence, papers, etc., are sorted by subject, date, or otherwise, for systematic handling.</li><li>Any part of an embryo that stimulates the development and differentiation of another part.</li></ul>