Wiktionary has related dictionary definitions, such as:

atom

Atom refers to smallest possible particle of ordinary matter. Wikipedia does not have an article with this exact name. ... Wiktionary is a Wikimedia Foundation project intended to be a free wiki dictionary (hence: Wiktionary) (including thesaurus and lexicon) in every language. ... Properties In chemistry and physics, an atom (Greek άτομον meaning indivisible) is the smallest possible particle of a chemical element that retains its chemical properties. ...

Atom may also mean:

• Atomism, philosophical musings about the basic building blocks of reality
• Atom (comics), superheroes of the DC Universe
• Atom (measure theory), a minimal measurable set
• Atom (standard), an XML-based Web syndication format
• Atom: Journey Across the Subatomic Cosmos, a book by Isaac Asimov
• The band Atom and His Package's sole member Adam Goren
• Acorn Atom, an early 1980's home computer
• The lexical elements in the Prolog programming language
• "Mighty Atom" is the translation of the Japanese name of the animated series Astro Boy
• An Ur-element, in set theory
• The narrator of The History and Adventures of an Atom, a satire by Tobias Smollett
• A feature of the X Window protocol, used for referring to character strings
• The Ariel Atom, a high performance sports car made by Ariel Ltd
• A level in minor hockey for ages 9-10

Wiktionary has related dictionary definitions, such as:

atomic

Atomic may refer to: In natural philosophy, atomism is the theory that all the objects in the universe are composed of very small, indestructible elements. ... The Atom is a DC Comics superhero. ... In mathematics, more precisely in measure theory, an atom is a measurable set which has positive measure and contains no smaller set of positive measure. ... Atom is the name of a specific web feed format. ... Atom: Journey Across the Subatomic Cosmos is a non-fiction book by Isaac Asimov and published in 1992. ... Adam Goren (b. ... The Atom was Acorns first computer to be aimed squarely at the home market. ... Prolog is a logic programming language. ... Astro Boy Volume 1, English version Astro Boy is the American title for the Japanese animated series Tetsuwan Atomu (鉄腕アトム), which roughly translates to Mighty Atom (literally Iron-arm Atom); or Atom boy first broadcast on Japanese television from 1964 to 1966. ... Definition In set theory a ur-element is something which is not a set, but may itself be an element of a set. ... The History and Adventures of an Atom, by Tobias Smollett (1769). ... The X Window System logo The X Window core protocol[1][2][3] is the base protocol of the X Window System, which is a networked windowing system for bitmap displays used to build graphical user interfaces on Unix, Unix-like, and other operating systems. ... The Ariel Atom is a high performace sports car made by Ariel vehicles based in Birmingham, England. ... Minor hockey is ice hockey for minors. ... Wikipedia does not have an article with this exact name. ... Wiktionary is a Wikimedia Foundation project intended to be a free wiki dictionary (hence: Wiktionary) (including thesaurus and lexicon) in every language. ...

• Atomic (album), by the band Lit
• Atomic (song), by the band Blondie
• Atomic (song), by the band Tiger Army
• Atomic (jazz band), a Norwegian jazz quintet
• Atomic (magazine), an Australian computing and technology magazine
• Atomic (order theory)
• The Atomic bomb, a kind of Nuclear weapon
• Atomic energy, now usually called Nuclear power
• Atomic number, the number of protons found in the nucleus of an atom
• Atomic Skis, an Austrian ski producer
• Atomic operation, in computer science
• Atomicity, in databases
• Atomic Kitten, an English all-female pop group