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Webster 1913 Edition

Noun.

The art or practice of casting horoscopes, or observing the disposition of the stars, with a view to prediction events.

Aspect of the stars at the time of a person’s birth.

Noun.

The art or practice of predicting future events by the disposition of the stars and planets.

horoscopy ‎(uncountable)

casting of horoscopes

aspect of the stars at the time of a person's birth