Definition A:

Documents created specifically for a transitory purpose. Advertisements, calling cards, notices, and tickets are examples of ephemera.

- SAA Glossary -

Definition B:

Ephemera are those everyday, impermanent items produced irregularly and designed to use and then throw away. Pamphlets, brochures, tickets, programmes, published reports, handbolls, menus, advertisements, posters, and other miscellaneous printed or published items are all considered ephemera.

- Association of British Columbia Archivists -

Definition C:

Ephemera (e-phem-er-a) is a term used to embrace a wide range of minor, everyday documents and artifacts, most intended for one-time or short-term use.

- Ephemera Society of America -