showing only Slang/Internet Slang definitions (show all 27 definitions). Ions are identified by the use of a superscript to show the sign and size of their electric charge. Ion definition, an electrically charged atom or group of atoms formed by the loss or gain of one or more electrons, as a cation (positive ion ), which is created by electron loss and is attracted to the cathode in electrolysis, or as an anion (negative ion ), which is created by an electron gain and is attracted to the anode. new search; suggest new definition; Search for ION in Online Dictionary … Return to top of page. See more. See more. This is not meant to be a formal definition of ion like most terms we define on Dictionary.com, but is rather an informal word summary that hopefully touches upon the key aspects of the meaning and usage of ion that will help our users expand their word mastery. Note: We have 52 other definitions for ION in our Acronym Attic. Definition of Ion. See more. Submitted by Walter Rader (Editor) from Sacramento, CA, USA on Dec 17 2010. acronym for "in other news". An ion is an atom or molecule that carries an electric charge. Define ion. Anions and Cations. How to use ion in a sentence. Ion: AGRICULTURAL AND ENVIRONMENTAL BIOTECHNOLOGY [home, info] ION: Zoom Astronomy Glossary [home, info] Slang (1 matching dictionary) ion: Urban Dictionary [home, info] Tech (14 matching dictionaries) ion: Webster's New World Telecom Dictionary [home, info] ION: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING [home, info] Ion got plans tomorrow.Ion know how to spell very well. How is your day going! Last edited on Feb 09 2018. Ion definition is - an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons. ion synonyms, ion pronunciation, ion translation, English dictionary definition of ion. See more words with the same meaning: alternative spellings or pronunciations (list of). ... Search the Dictionary for More Terms. Definition definition, the act of defining, or of making something definite, distinct, or clear: We need a better definition of her responsibilities. Matthew: bruh bre broo bruh breee bree bruh bruh buhre bruh bre broo bruh breee bree bruh bruh buhre bruh bre broo bruh breee bree bruh bruh buhre bruh bre broo bruh breee bree bruh bruh buhre bruh bre broo bruh breee bree bruh bruh buhre bree bruh bruh bree eeee bruh bruh bree. See more. — carla (urban_mermaid) (@u_m) October 29, 2007. This definition is questionable and is pending deletion. Anion definition, a negatively charged ion, as one attracted to the anode in electrolysis. n. 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