Cat or CAT may have several different meanings:

• Animals
  • Cat, the common name for the domestic cat (Felis silvestris catus).
  • Big cat, wild animals related to the domestic cat, such as lions, tigers, cheetahs, panthers, and jaguars.
  • A generic term for any animal classfied in the cat family Felidae.

• Jargon
  • Nautical
    • A term for boats such as catamaran or a catboat
    • A cathead , or a device for raising an anchor to the cathead
    • The cat o' nine tails, a multi-tailed whip used for corporal punishment in the British navy
  • cat, the concatenate program in the Unix operating system

• Names
  • Caterpillar, the main trademark of Caterpillar Inc.
  • Cath, Catherine, Cathryn, and Cathy, female names.

• Slang
  • A woman who is regarded as spiteful.
  • A person, especially a man.
  • A player or devotee of jazz music.

• An acronym for:-
  • Cambridge Antibody Technology , the UK biotechnology company
  • Citizens Area Transit, public transportation by bus in Clark County, Nevada (Las Vegas )
  • Civil Air Transport, the airline forerunner of Air America that was formed after World War II by General Claire Lee Chennault of the Flying Tigers
  • In airplane flying, clear air turbulence
  • Computed axial tomography, a tomographical X-ray technique.
  • Common Admission Test, a graduate test in India, conducted by the Indian Institutes of Management. The entrance test conducted by Cochin University of Science and Technology is also known as the Common Admission Test.
  • Computer-assisted translation, a form of computer software used to help human translators
  • Computer-adaptive test, a type of test that dynamically adapts to the testee's ability level.

• Pop culture
  • Felis sapiens, a sentient fictional species from the Red Dwarf television series.

• Abbreviations
  • The stock symbol for Caterpillar Inc. and a short trademark name for the company's products.
  • An abbreviation for category, for example Cat 5 cable.