pie
/pī/
noun
1. a baked dish of fruit, or meat and vegetables, typically with a top and base of pastry. synonyms: pastry, turnover
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pi1
(pī)
n.
1. (also pē) The 16th letter of the Greek alphabet. See Table at alphabet.
2. Mathematics A transcendental number, approximately 3.14159, represented by the symbol π, that expresses the ratio of the circumference to the diameter of a circle and appears as a constant in many mathematical expressions.