- lasting a very short time; short-lived; transitory: the ephemeral joys of childhood.
- lasting but one day: an ephemeral flower.
- anything short-lived, as certain insects.
- lasting for only a short time; transitory; short-livedephemeral pleasure
- a short-lived organism, such as the mayfly
- a plant that completes its life cycle in less than one year, usually less than six months