All 5 Uses

halcyon
in
Ulysses, by James Joyce
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It was Gerty who turned off the gas at the main every night and it was Gerty who tacked up on the wall of that place where she never forgot every fortnight the chlorate of lime Mr Tunney the grocer's christmas almanac, the picture of halcyon days where a young gentleman in the costume they used to wear then with a threecornered hat was offering a bunch of flowers to his ladylove with oldtime chivalry through her lattice window.†
Chpt 13

halcyon = idyllically calm and peaceful
She often looked at them dreamily when she went there for a certain purpose and felt her own arms that were white and soft just like hers with the sleeves back and thought about those times because she had found out in Walker's pronouncing dictionary that belonged to grandpapa Giltrap about the halcyon days what they meant.†
Chpt 13
Halcyon days.†
Chpt 15 *
Halcyon days, high school boys in blue and white football jerseys and shorts, Master Donald Turnbull, Master Abraham Chatterton, Master Owen Goldberg, Master Jack Meredith, Master Percy Apjohn, stand in a clearing of the trees and shout to Master Leopold Bloom.†
Chpt 15
THE HALCYON DAYS: Mackerel!†
Chpt 15

Definitions:

(1) (halcyon)
calm, carefree, and idyllically happy

In Greek mythology, a halcyon is a mythical bird said to breed at the time of the winter solstice in a nest floating on the sea and to have the power of calming the winds and waves.
(2) (meaning too rare to warrant focus)