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  1. [noun] the ratio of the circumference to the diameter of a circle
    Synonyms: 3.14159265358979323846...

  2. [noun] someone who can be employed as a detective to collect information
    Synonyms: private detective, PI, private eye, private investigator, operative, shamus, sherlock

  3. [noun] the scientist in charge of an experiment or research project
    Synonyms: principal investigator, PI

  4. [noun] the 16th letter of the Greek alphabet

  5. [noun] 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, PI


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