What is the meaning of the term 'philatelist'?

The term 'philatelist' refers specifically to an individual who collects stamps. This hobby encompasses not only the collection of stamps but also the study of various aspects of stamps, such as their history, design, and production. Philatelists often seek out rare or unique stamps and may be interested in the stories and contexts behind different issues, making it a rich and educational pursuit. Collecting stamps can also include knowledge about postal history and issues related to post office services.

The other definitions provided do not align with the term 'philatelist.' Philosophy is associated with metaphysical and theoretical inquiry, poetry involves literary expression, and political activism pertains to social and political movements. None of these activities relate to stamp collecting or the study thereof, which is the essence of being a philatelist.