Usually means: Performance of a deed; behavior.
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We found 65 dictionaries that define the word act:

General (28 matching dictionaries)
  1. ACT, act: Merriam-Webster.com
  2. ACT, act: Oxford Learner's Dictionaries
  3. ACT, ACT, act: American Heritage Dictionary of the English Language
  4. act: Collins English Dictionary
  5. act: Vocabulary.com
  6. Act, act: Wordnik
  7. act: Cambridge Advanced Learner's Dictionary
  8. A.C.T, ACT, Act, act: Wiktionary
  9. act: Webster's New World College Dictionary, 4th Ed.
  10. act: The Wordsmyth English Dictionary-Thesaurus
  11. act: Infoplease Dictionary
  12. A.C.T, ACT, act: Dictionary.com
  13. act (n.): Online Etymology Dictionary
  14. act: Cambridge Essential American English Dictionary
  15. A.C.T, ACT (NASDAQ), ACT (audio format), ACT (examination), ACT (nonprofit organization), ACT (test), ACT, ACT, Act (band), Act (document), Act (drama), Act (law), Act (theater), Act, The Act (TV series), The Act (album), The Act (band), The Act (musical), The Act (video game), The Act: Wikipedia, the Free Encyclopedia
  16. Act: Online Plain Text English Dictionary
  17. act: Webster's Revised Unabridged, 1913 Edition
  18. act: Rhymezone
  19. act: AllWords.com Multi-Lingual Dictionary
  20. act: Webster's 1828 Dictionary
  21. ACT: Stammtisch Beau Fleuve Acronyms
  22. act: Free Dictionary
  23. act: Mnemonic Dictionary
  24. ACT: Dictionary/thesaurus
  25. act: Wikimedia Commons US English Pronunciations
  26. act: Merriam-Webster.com

Art (5 matching dictionaries)
  1. Technical Glossary of Theatre Terms (No longer online)
  2. The Organon: A Conceptually Indexed Dictionary (by Genus and Differentia) (No longer online)
  3. Literary Criticism (No longer online)
  4. act-, act-: A Cross Reference of Latin and Greek Elements
  5. Glossary of Stamp Collecting Terms (No longer online)

Business (16 matching dictionaries)
  1. act: Webster's New World Law Dictionary
  2. Duhaime's Canadian law dictionary (No longer online)
  3. act: Law.com Dictionary
  4. Everybody's Legal Dictionary (No longer online)
  5. THE 'LECTRIC LAW LIBRARY'S REFERENCE ROOM (No longer online)
  6. Glossary of Legal Terms (No longer online)
  7. ACT: bizterms.net
  8. C-SPAN Congressional Glossary (No longer online)
  9. Glossary of Crop Abbreviations (No longer online)
  10. Act: GLOSSARY OF LEGISLATIVE TERMS
  11. The Act: Glossary of Consumer Proposals Terms
  12. Bouvier's Law Dictionary 1856 Edition (No longer online)
  13. ACT: Investopedia
  14. Act: INSOLVENCY
  15. Act (disambiguation), Act (legislature), act: Legal dictionary
  16. BusinessDictionary.com (No longer online)

Computing (2 matching dictionaries)
  1. ACT: Free On-line Dictionary of Computing
  2. ACT, Act (disambiguation), Act (legislature), Act, act: Encyclopedia

Medicine (3 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. ACT, Act (disambiguation), Act (legislature), act-: Medical dictionary
  3. PERFUSION TECHNOLOGY, OPEN HEART SURGERY AND CARDIOLOGY (No longer online)

Miscellaneous (4 matching dictionaries)
  1. ACT: Acronym Finder
  2. ACT: Three Letter Words with definitions
  3. AbbreviationZ (No longer online)
  4. act: Idioms

Science (1 matching dictionary)
  1. ACT: A Dictionary of Quaternary Acronyms and Abbreviations

Slang (2 matching dictionaries)
  1. act: Green’s Dictionary of Slang
  2. A.C.T, ACT: Urban Dictionary

Sports (1 matching dictionary)
  1. Act: Dan's Poker

Tech (3 matching dictionaries)
  1. AUTOMOTIVE TERMS (No longer online)
  2. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  3. act (segment): Television: Critical Methods and Applications

(Note: See acted as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (New Zealand politics) ACT New Zealand, a liberal conservative political party in New Zealand
noun:  (countable) An instance of a certain standardized college admissions test in the United States, originally called the American College Test.
noun:  (countable) Something done, a deed.
noun:  (obsolete, uncountable) Actuality.
noun:  (theology) Something done once and for all, as distinguished from a work.
noun:  (law, countable) A product of a legislative body, a statute.
noun:  The process of doing something.
noun:  (countable) A formal or official record of something done.
noun:  (countable, drama) A division of a theatrical performance.
noun:  (countable) A performer or performers in a show.
noun:  (countable) Any organized activity.
noun:  (countable) A display of behaviour.
noun:  (countable) A display of behaviour meant to deceive.
noun:  A thesis maintained in public, in some English universities, by a candidate for a degree, or to show the proficiency of a student.
verb:  (intransitive) To do something.
verb:  (obsolete, transitive) To do (something); to perform.
verb:  (intransitive) To perform a theatrical role.
verb:  (intransitive) Of a play: to be acted out (well or badly).
verb:  (intransitive) To behave in a certain manner for an indefinite length of time.
verb:  (copulative) To convey an appearance of being.
verb:  (intransitive) To do something that causes a change binding on the doer.
verb:  (intransitive, construed with on or upon) To have an effect (on).
verb:  (transitive) To play (a role).
verb:  (transitive) To feign.
verb:  (intransitive, law) To carry out work as a legal representative in relation to a particular legal matter.
verb:  (intransitive, mathematics, construed with on or upon, of an algebraic structure) To possess an action onto (some other structure). Examples include the group action of a group on a set, the action of a ring on a module by scalar multiplication, and the action of a group or algebra on a vector space via a representation.
verb:  (obsolete, transitive) To move to action; to actuate; to animate.
verb:  (obsolete, Scotland, transitive) To enact; to decree.
noun:  Initialism of Australian Capital Territory, a federal territory of Australia. [A federal territory which is an enclave in southern New South Wales, south-eastern Australia, in which the country's capital, Canberra, is located.]
noun:  Initialism of American College Test.
noun:  Initialism of Association of Consumers and Taxpayers, a political party of New Zealand
noun:  (uncountable) Acronym of acceptance and commitment therapy. [A form of psychological therapy based on acceptance and mindfulness strategies.]
noun:  (law) Ellipsis of act of parliament. [A law which has received assent (royal, presidential or gubernatorial) after having been passed by the houses (or house) of a parliament.]
adverb:  (text messaging) Clipping of actually. [(modal) In act or in fact; really; in truth; positively.]
noun:  Ellipsis of Act of Parliament.

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