1. Plural of ephemera; things that are short-lived, temporary, or transitory in nature.
Usage: Often used to refer to collectible items designed to be discarded, such as tickets, posters, or advertisements.
2. Plural of ephemera; insects of the order Ephemeroptera, commonly known as mayflies, which have very short adult lifespans.
Usage: Scientific or entomological usage.

Examples

• The museum's collection of ephemeras includes vintage concert tickets and old movie posters.
• Collectors often seek out ephemeras from the 1960s as valuable memorabilia.
• The artist created an installation using ephemeras to represent the fleeting nature of modern life.
• Ephemeras like business cards and flyers are rarely preserved for future generations.
• The stream was filled with ephemeras during the spring hatch, attracting many trout fishermen.