Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “ion”

See all translations

ion

noun [C] /ˈaɪ.ən/ specialized us  
an atom or small group of atoms that has an electrical charge because it has added or lost one or more electrons
ionic
adjective uk   /aɪˈɒn.ɪk/ us    /-ˈɑː.nɪk/
ionic bonding
Translations of “ion”
in Spanish ión, ion…
in Chinese (Traditional) 離子…
in Chinese (Simplified) 离子…
(Definition of ion noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of ion?
Add Cambridge dictionaries to your browser to your website

Definitions of “ion” in other dictionaries

Word of the Day

derivative

If something is derivative, it is not the result of new ideas, but has been developed from or copies something else.

Word of the Day

Lies, lies, lies!

by Kate Woodford,
February 25, 2015
​​​ According to sociologists (=people who study the relationships between people living in groups), we are good at lying. As a species, we have developed a remarkable ability to deceive each other (= persuade each other that something false is true). Being able to say things that are not true can help with

Read More 

snapchat verb

March 02, 2015
to send someone a message using the photomessaging application Snapchat We used to have a thing until he got a girlfriend. now

Read More