Definitions for "Halcyon"
A kingfisher. By modern ornithologists restricted to a genus including a limited number of species having omnivorous habits, as the sacred kingfisher (Halcyon sancta) of Australia.
Pertaining to, or resembling, the halcyon, which was anciently said to lay her eggs in nests on or near the sea during the calm weather about the winter solstice.
Hence: Calm; quiet; peaceful; undisturbed; happy.
"Halcyon" is a song written and performed by Orbital. In its original form, the song is a melancholy tribute to the addictive sedative Halcion (Triazolam), which the Hartnoll brothers' mother reportedly used. This original form of the song is relatively uncommon; it did not appear on a full-length album until the compilation Work 1989-2002.
"Halcyon" is a trance song by British DJ and trance artist Chicane, pseudonym of Nick Bracegirdle. It is the 5th track of his second album Behind the Sun and also part of the "No Ordinary Morning" / "Halcyon" double A-side CD single – the third released from the album.
Keywords:  thayer, rdi, raiders, laserdisc, quest
The Halcyon was a home video game console released in January of 1985 by RDI Video Systems. The initial retail price for the system was $2500, and it featured a laserdisc player and attached computer, each the size of an early-model VCR. Only two games were released for the system before RDI went bankrupt: Thayer's Quest and Raiders vs.
Halcyon is an Indie role-playing game, independently published by Mind Riot Studios in 2006.
Halcyon is a Stargate Atlantis tie-in novel by James Swallow, published by Fandemonium in the UK and available worldwide. The book is sometime between the season 2 episodes Runner and The Lost Boys.