Etymology
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pi (n.)

Greek letter corresponding to the Roman P, from Phoenician, literally "little mouth." As the name of the mathematical constant for the ratio of the circumference of a circle to the diameter, from 1841 in English, used in Latin 1748 by Swiss mathematician Leonhard Euler (1707-1783), as an abbreviation of Greek periphereia "periphery." For the printer's term for mixed type (often spelled pi), see pie (3).

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Definitions of pi

pi (n.)
the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...;
pi (n.)
someone who can be employed as a detective to collect information;
Synonyms: private detective / private eye / private investigator / operative / shamus / sherlock
pi (n.)
the scientist in charge of an experiment or research project;
Synonyms: principal investigator
pi (n.)
the 16th letter of the Greek alphabet;
pi (n.)
an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs;
Synonyms: protease inhibitor
From wordnet.princeton.edu