a small British almanac (=a book giving information about the movement of the sun and moon, the times of the tides etc) which is produced each year and sold in large numbers. It also makes predictions (=saying what will probably happen in the future) based on such things as the position of theplanets in the sky. Its predictions are often about political events or famous people.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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