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Astronomy. a northern constellation between Cepheus and Perseus.
Classical Mythology. the wife of Cepheus and mother of Andromeda.
Historical Examples

Turning towards the north, we see Cassiopeia between the Pole-star and the horizon.
Half-hours with the Telescope Richard A. Proctor

This is not, like Ursa Major, or like Cassiopeia, said to be “circumpolar.”
The Story of the Heavens Robert Stawell Ball

Besides, Cassiopeia and the Whale are constellations very different in position.
Myths and Marvels of Astronomy Richard A. Proctor

Except that I like their names, Aldebaran and Cassiopeia, and so on.
Fantasia of the Unconscious D. H. Lawrence

You of the ‘Crown’ and the ‘Lyre,’ to seek influences from the ‘chair of Cassiopeia’!
The Letters of Robert Browning and Elizabeth Barrett Barrett, Vol. 1 (of 2) 1845-1846 Robert Browning and Elizabeth Barrett Barrett

The correct name of this constellation is Cassiopeia’s Chair.
Earth and Sky Every Child Should Know Julia Ellen Rogers

Cetus, you will recall, represents the sea-monster sent to devour Andromeda, the daughter of Cepheus and Cassiopeia.
Astronomy for Young Folks Isabel Martin Lewis

And the way to find this arc is to draw a curve from Capella to Cassiopeia.
Earth and Sky Every Child Should Know Julia Ellen Rogers

“I am glad to hear that you are going to give the ukelele to Cassiopeia,” said Uncle Henry.
The Star People Gaylord Johnson

The stars of Cassiopeia are not only misplaced, but roughly represented.
Astronomical Myths John F. Blake

noun
(Greek myth) the wife of Cepheus and mother of Andromeda
noun (Latin genitive) Cassiopeiae (ˌkæsɪəˈpiːiː)
a very conspicuous W-shaped constellation near the Pole Star. Cassiopeia A is a very strong radio and X-ray source, identified as the remnant of a supernova thought to have occurred in the late 17th century
n.

northern constellation, in Greek mythology queen of Ethiopia and mother of Andromeda, from Latinized form of Greek Kassiepeia, Kassiopeia, of unknown etymology. Related: Cassiopeian.
Cassiopeia
(kās’ē-ə-pē’ə)
A W-shaped constellation in the Northern Hemisphere near Andromeda and Cepheus.