Definition of ion
1 : 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
2 : a charged subatomic particle (such as a free electron)
Recent Examples of ion from the Web
The cost of lithium ion batteries, the gold standard in solar power storage, has fallen significantly, Mr. Turner said, largely because of economies of scale.
MARRAKECH, Morocco — Morocco’s government ion Thursday defended police actions in a northern town where arrests of demonstrators have aggravated public anger over corruption and poor economic conditions.
Lapan said Tuesday's fire aboard a Jet Blue flight caused by a lithium-ion battery did not change the government's thinking about expanding the restriction on electronic devices.
Most rechargeable electronic devices, like laptops, are powered by lithium-ion batteries.
Last year, Samsung's Galaxy Note 7 phones were banned from all flights after the company discovered that its lithium-ion batteries were faulty and could overheat and catch fire.
The Pennsylvania and Indiana prison systems regularly use ion detection scanning –
Nerve cells have tiny pores in their cell membranes that regulate the flow of sodium ions into the cell, which in turn modulates the firing of the cell.
That means a lithium ion battery can run at a higher power for a longer time than a nickel metal battery of the same weight.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ion'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Definition of Ion
Definition of -ion
1a : act or process validationb : result of an act or process regulation
2 : state or condition hydration
Origin and Etymology of -ion
French -ion, from Latin -ion-, -io
ION Defined for English Language Learners
Definition of ion for English Language Learners
: an atom or group of atoms that has a positive or negative electric charge from losing or gaining one or more electrons
Definition of -ion for English Language Learners
: act or process
: result of an act or process
: state or condition
ION Defined for Kids
Definition of ion for Students
: an atom or group of atoms that carries an electric charge
Definition of -ion for Students
1 : act or process construction
2 : result of an act or process regulation eruption
3 : state or condition perfection
Seen and Heard
What made you want to look up ion? Please tell us where you read or heard it (including the quote, if possible).