adjective Also, halcyonian [hal-see-oh-nee-uhn] , halcyonic [hal-see-on-ik] .
calm; peaceful; tranquil: halcyon weather.
rich; wealthy; prosperous: halcyon times of peace.
happy; joyful; carefree: halcyon days of youth.
of or pertaining to the halcyon or kingfisher.
a mythical bird, usually identified with the kingfisher, said to breed about the time of the winter solstice in a nest floating on the sea, and to have the power of charming winds and waves into calmness.
any of various kingfishers, especially of the genus Halcyon.
(initial capital letter) Classical Mythology, Alcyone ( def 2 ).

1350–1400; < Latin < Greek halkyṓn, pseudo-etymological variant of alkyṓn kingfisher; replacing Middle English alceon, alicion < Latin alcyōn < Greek

1. serene, placid, pacific, untroubled.
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World English Dictionary
halcyon (ˈhælsɪən)
1.  peaceful, gentle, and calm
2.  halcyonian, also: halcyonic happy and carefree
3.  Greek myth a fabulous bird associated with the winter solstice
4.  a poetic name for the kingfisher
5.  halcyon days
 a.  a fortnight of calm weather during the winter solstice
 b.  a period of peace and happiness
[C14: from Latin alcyon, from Greek alkuōn kingfisher, of uncertain origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1545, in halcyon dayes (L. alcyonei dies, Gk. alkyonides hemerai), 14 days of calm weather at the winter solstice, when a mythical bird (identified with the kingfisher) was said to breed in a nest floating on calm seas. From halcyon (n.), 1390, from L. halcyon, from Gk. halkyon, variant (perhaps a misspelling)
of alkyon "kingfisher," from hals "sea, salt" + kyon "conceiving," prp. of kyein "to conceive," lit. "to swell," from PIE base *keue- "to swell." Identified in mythology with Halcyone, daughter of Aeolus, who when widowed threw herself into the sea and became a kingfisher.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
As a matter of fact, the Hearst empire itself was long past the halcyon days of
  the 1920s.
He ascended to stardom in the 1940's, at the start of ventriloquism's halcyon
Despite the years since their halcyon youth, they made brave efforts to dance.
Those were the halcyon years, when I could match a company's quid with our quo.
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