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.
See also. 1  Comparison of instant messaging clients. 2  Ephemera â any transitory written or printed matter not meant to be retained or preserved. 3  List of virtual communities with more than 100 million active users. 4  Timeline of social media. 5  Sobrr, another mobile application which deletes content after a specified time.