pho·​to·​ion·​i·​za·​tion | \ ˌfō-tō-ˌī-ə-nə-ˈzā-shən How to pronounce photoionization (audio) \

Definition of photoionization

: ionization (as in the ionosphere) of a molecule or atom caused by absorption of radiant energy

Keep scrolling for more

Other Words from photoionization

photoionize \ ˌfō-​tō-​ˈī-​ə-​ˌnīz How to pronounce photoionize (audio) \ transitive verb

Examples of photoionization in a Sentence

Recent Examples on the Web The breathing zone will be monitored with a photoionization detector to screen for volatile organic compounds (in the work zone). al, "3M to test soil, groundwater at landfill near Decatur school," 14 Jan. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'photoionization.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of photoionization

1914, in the meaning defined above

Keep scrolling for more

Learn More about photoionization

Time Traveler for photoionization

Time Traveler

The first known use of photoionization was in 1914

See more words from the same year

Statistics for photoionization

Cite this Entry

“Photoionization.” Dictionary, Merriam-Webster, Accessed 25 Oct. 2020.

More from Merriam-Webster on photoionization Encyclopedia article about photoionization

Comments on photoionization

What made you want to look up photoionization? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Namesakes Word Quiz

  • a citrus fruit possibly named after a person
  • Which of the following is a fruit named after a Moroccan seaport?
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!