Attention deficit hyperactivity disorder (ADHD) should be diagnosed and treated in children as young as age 4, according to new guidelines from the American Academy of Pediatrics. Skip to main content
ephemeris. 1  a table showing the positions of a heavenly body on a number of dates in a regular sequence. 2  an astronomical almanac containing such tables. 3  Archaic. an almanac or calendar.
Ephemera are defined as objects, often printed, that are not intended to last but are sometimes kept by collectors. An example of ephemera is a program from a hit Broadway show. pl. -Â·eras or -Â·eraeÂ·. 1  mayfly. 2  an ephemeral thing.  ephemeral things collectively.