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Audio English.org » Dictionary » P » Physical Process ... Pianism

PI

Pronunciation (US): 

 Dictionary entry overview: What does PI mean? 

PI (noun)
  The noun PI has 5 senses:

1. the ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...
2. someone who can be employed as a detective to collect information
3. the scientist in charge of an experiment or research project
4. the 16th letter of the Greek alphabet
5. an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs

  Familiarity information: PI used as a noun is common.


 Dictionary entry details 


PI (noun)


Sense 1pi [BACK TO TOP]

Meaning:

The ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...

Classified under:

Nouns denoting quantities and units of measure

Hypernyms ("pi" is a kind of...):

transcendental number (an irrational number that is not algebraic)


Sense 2PI [BACK TO TOP]

Meaning:

Someone who can be employed as a detective to collect information

Classified under:

Nouns denoting people

Synonyms:

private eye; private detective; shamus; sherlock; private investigator; PI; operative

Hypernyms ("PI" is a kind of...):

detective (an investigator engaged or employed in obtaining information not easily available to the public)

Hyponyms (each of the following is a kind of "PI"):

hotel detective; house detective; house dick (a private detective employed by a hotel or retail store)

inquiry agent (a private detective)

store detective (a private detective employed by a merchant to stop pilferage)


Sense 3PI [BACK TO TOP]

Meaning:

The scientist in charge of an experiment or research project

Classified under:

Nouns denoting people

Synonyms:

principal investigator; PI

Hypernyms ("PI" is a kind of...):

man of science; scientist (a person with advanced knowledge of one or more sciences)


Sense 4pi [BACK TO TOP]

Meaning:

The 16th letter of the Greek alphabet

Classified under:

Nouns denoting communicative processes and contents

Hypernyms ("pi" is a kind of...):

alphabetic character; letter; letter of the alphabet (the conventional characters of the alphabet used to represent speech)

Holonyms ("pi" is a member of...):

Greek alphabet (the alphabet used by ancient Greeks)


Sense 5PI [BACK TO TOP]

Meaning:

An antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs

Classified under:

Nouns denoting man-made objects

Synonyms:

protease inhibitor; PI

Hypernyms ("PI" is a kind of...):

antiviral; antiviral agent; antiviral drug (any drug that destroys viruses)

Hyponyms (each of the following is a kind of "PI"):

Crixivan; indinavir (a protease inhibitor (trade name Crixivan) used for treating HIV)

nelfinavir; Viracept (a protease inhibitor (trade name Viracept) used in treating HIV usually in combination with other drugs)

Norvir; ritonavir (a protease inhibitor (trade name Norvir) used in treating HIV)

Invirase; saquinavir (a weak protease inhibitor (trade name Invirase) used in treating HIV)

Holonyms ("PI" is a part of...):

drug cocktail; HAART; highly active antiretroviral therapy (a combination of protease inhibitors taken with reverse transcriptase inhibitors; used in treating AIDS and HIV)


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