1. pi, 3.14159265358979323846... -- (the ratio of the circumference to the diameter of a circle).
2. private detective, PI, private eye, private investigator, operative, shamus, sherlock -- (someone who can be employed as a detective to collect information).
3. principal investigator, PI -- (the scientist in charge of an experiment or research project).
4. pi -- (the 16th letter of the Greek alphabet).
5. protease inhibitor, PI -- (an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs).
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