Meaning

• Objects that are designed to be short-lived.

  "vintage ephemera"

• (library science) Published single-sheet or single page documents which are meant to be thrown away after one use.

• (by extension) Transitory audiovisual matter not intended to be retained or preserved.

  "audio ephemera"

Meaning

• Something short-lived or transitory.

• A type of weak reference in a garbage collected programming language that does not permit an object to be kept alive by its finalizer.