Usually means: Basic unit of chemical element.
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We found 60 dictionaries that define the word atom:

General (26 matching dictionaries)
  1. atom: Merriam-Webster.com
  2. atom: Oxford Learner's Dictionaries
  3. atom: American Heritage Dictionary of the English Language
  4. atom: Collins English Dictionary
  5. atom: Vocabulary.com
  6. Atom, Atom, atom: Wordnik
  7. atom: Cambridge Advanced Learner's Dictionary
  8. atom: Wiktionary
  9. atom: Webster's New World College Dictionary, 4th Ed.
  10. atom: The Wordsmyth English Dictionary-Thesaurus
  11. atom: Infoplease Dictionary
  12. atom: Dictionary.com
  13. atom: Online Etymology Dictionary
  14. atom: Cambridge Essential American English Dictionary
  15. A.T.O.M, A.T.O.M. (TV series), ATOM (IFV), ATOM, Atom (Al Pratt), Atom (Asimov book), Atom (DC Comics), Atom (Intel), Atom (Krauss book), Atom (Ray Palmer), Atom (Ryan Choi), Atom (Web standard), Atom (character), Atom (comics), Atom (disambiguation), Atom (measure theory), Atom (order theory), Atom (programming language), Atom (software), Atom (standard), Atom (system on chip), Atom (text editor), Atom (time), Atom (video game), Atom, The Atom (comics), The Atom: Wikipedia, the Free Encyclopedia
  16. Atom: Online Plain Text English Dictionary
  17. atom: Webster's Revised Unabridged, 1913 Edition
  18. atom: Rhymezone
  19. Atom-, Atom (nt), atom: AllWords.com Multi-Lingual Dictionary
  20. atom: Webster's 1828 Dictionary
  21. atom: Free Dictionary
  22. atom: Mnemonic Dictionary
  23. atom: Dictionary/thesaurus
  24. atom: Merriam-Webster.com

Business (1 matching dictionary)
  1. Construction Term Glossary (No longer online)

Computing (5 matching dictionaries)
  1. Atom: Netlingo
  2. Atom: ILC Internet Terms
  3. Webopedia (No longer online)
  4. Technopedia (No longer online)
  5. atom: Encyclopedia

Medicine (6 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. Atom: MedTerms.com Medical Dictionary
  3. Atom: MedFriendly Glossary
  4. online medical dictionary (No longer online)
  5. atom: Medical dictionary
  6. Atom: Drug Medical Dictionary

Miscellaneous (3 matching dictionaries)
  1. Encyclopedia of Graphic Symbols (No longer online)
  2. ATOM: Acronym Finder
  3. AbbreviationZ (No longer online)

Religion (1 matching dictionary)
  1. Atom: Catholic Encyclopedia

Science (12 matching dictionaries)
  1. From Stargazers to Starships Glossary (No longer online)
  2. Chemistry Dictionary (No longer online)
  3. Atom: Eric Weisstein's World of Mathematics
  4. Atom: Eric Weisstein's World of Physics
  5. Illustrated Glossary of Geologic Terms (No longer online)
  6. Atom: Extragalactic Astronomy
  7. atom, atom, atom (measure theory): PlanetMath Encyclopedia
  8. Atom: NRC Glossary of Nuclear Terms --
  9. atom: UNCChem Glossary
  10. How Many? A Dictionary of Units of Measurement (No longer online)
  11. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)
  12. ATOM: Zoom Astronomy Glossary

Slang (1 matching dictionary)
  1. Atom, a.t.o.m: Urban Dictionary

Tech (5 matching dictionaries)
  1. atom: Electronics
  2. Atom: Gems and Precious Stones
  3. Explosives (No longer online)
  4. ATOM: Power Engineering
  5. Nuclear Terms (No longer online)

(Note: See atoms as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (chemistry, physics) The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.
noun:  (history of science) A hypothetical particle posited by Greek philosophers as an ultimate and indivisible component of matter.
noun:  (now generally regarded figuratively) The smallest, indivisible constituent part or unit of something.
noun:  (philosophy) In logical atomism, a fundamental fact that cannot be further broken down.
noun:  (historical) The smallest medieval unit of time, equal to fifteen ninety-fourths of a second.
noun:  A mote of dust in a sunbeam.
noun:  A very small amount; a whit.
noun:  (computing, programming, Lisp) An individual number or symbol, as opposed to a list; a scalar value.
noun:  (mathematics) A non-zero member of a partially ordered set that has only zero below it (assuming that the poset has a least element, its "zero").
noun:  (mathematics, set theory) An element of a set that is not itself a set; an urelement.
noun:  (Canada, usually attributive) An age group division in hockey for nine- to eleven-year-olds.
noun:  A Meitei surname from Manipuri

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