mi·cro | \ ˈmī-(ˌ)krō \

Definition of micro 

(Entry 1 of 2)

1 : very small especially : microscopic

2 : involving minute quantities or variations


plural micros

Definition of micro (Entry 2 of 2)

Examples of micro in a Sentence

Recent Examples on the Web: Adjective

But once the novel zooms down to the micro-level, all details are invented. Mary Carole Mccauley, baltimoresun.com, "Anne Tyler's latest novel evokes Hamilton. Here are possible real-life stand-ins for locations in 'Clock Dance'," 13 July 2018 This soft, rainbow highlighter creates a silvery sheen with micro-pigments that is guaranteed to dazzle. Aliza Kelly Faragher, Allure, "What July's Pisces Horoscope Means for You," 29 June 2018 As a black woman, the effects of white supremacy and privilege, as well as micro-aggressions, can take an emotional toll. Sonja R. Herbert, SELF, "I’m a Fitness Instructor With Depression, and I Want You To Know About It," 22 June 2018 The profits are small because markets and individual farmers process micro-payments, often as little as a few dollars. Jane Black And Leah Douglas, chicagotribune.com, "Some food stamp recipients may soon lose access to farmers market benefits," 12 July 2018 New technologies that use data analytics to micro-target people give campaign groups the ability to connect with individual voters. NBC News, "U.K. will fine Facebook over Cambridge Analytica data breaches, regulator says," 10 July 2018 Relativity's Terran 1 rocket delivers a bit larger payload than many of the micro rockets under development for small satellites, with a capacity of 1,250kg to low Earth orbit, and Ellis believes this capability will be attractive to the military. Eric Berger, Ars Technica, "Rocket Report: Japanese rocket blows up, NASA chief ponders purpose of SLS," 6 July 2018 Fermented botanicals contain micro-organisms that release enzymes that ferment and break down molecules into the raw material, resulting in the creation of new substances that benefit the skin, explains dermatology professor Cho. Marian Liu, CNN, "Beyond beauty: Korean makeup provides 'cosmeceuticals'," 11 Apr. 2018 That gripping acidic flavor comes from grain that is fermented to produce alcohol, which little micro-organisms then consume and and convert into acetic acid. Alex Delany, Bon Appetit, "White Vinegar Is Our Desert Island Vinegar (Seriously)," 19 Feb. 2018

Recent Examples on the Web: Noun

For this listener, the micro-inflections in phrasing and dynamics often worked against the music’s broader expressive arc, but the performance overall drew hearty approval from the Shed audience. Jeremy Eichler, BostonGlobe.com, "Tanglewood opens with Bernstein’s exuberance, Lang Lang’s return," 8 July 2018 Sullivan and Cesario met while working for ethical fashion brands based in Uganda, helping impoverished women gain skills, savings, and eventually the money and know-how to start their own micro-enterprises. Hannah Wallace, Bon Appetit, "The Nut Butter Company Helping Formerly Homeless and Trafficked Women Build New Careers," 14 May 2018 The advent of arcades was as novel as the contemporary use of the micro-transactions common in mobile games now. Lindsay Grace, Smithsonian, "The Original ‘Space Invaders’ is an Icon of 1970s America’s Deepest Fears," 19 June 2018 For starters, does micro-dystrophin have the same functional benefit for patients as normal dystrophin? Adam Feuerstein, STAT, "With tantalizing early results, Sarepta’s gene therapy for Duchenne raises hopes for ‘real change’," 19 June 2018 Use a micro-liner pencil to create natural, hair-like strokes. Leah Prinzivalli, Teen Vogue, "Camila Mendes Reveals Her Favorite Eyebrow Products," 19 June 2018 The material uses thin metal micro-wires embedded with an electric current, which can change the wires’ temperature. Marco Santana, OrlandoSentinel.com, "UCF researchers develop color-changing fabric," 15 May 2018 In an era of brute-force micro-messaging, partisanship trumps statesmanship, pandering trumps policymaking. Nicholas Carr, chicagotribune.com, "Is Facebook the problem with Facebook, or is it us?," 10 July 2018 Plus, the rise in micro mills (the acquisition of small scale post-harvest equipment by farmers) has given growers control over their coffee. Lauren Mowery, USA TODAY, "Costa Rican coffee, from rural farms to Starbucks' visitor center," 26 June 2018

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

See More

First Known Use of micro


1923, in the meaning defined at sense 1


1971, in the meaning defined at sense 1

History and Etymology for micro



Keep scrolling for more

Learn More about micro

Statistics for micro

Last Updated

1 Sep 2018

Look-up Popularity

Time Traveler for micro

The first known use of micro was in 1923

See more words from the same year

Keep scrolling for more

More Definitions for micro


mi·cro | \ ˈmī-(ˌ)krō \

Medical Definition of micro 

1 : very small especially : microscopic

2 involving minute quantities or variations

More from Merriam-Webster on micro

Spanish Central: Translation of micro

Britannica English: Translation of micro for Arabic Speakers

Comments on micro

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


occurring twice a year or every two years

Get Word of the Day daily email!

Test Your Vocabulary

Name that Food Quiz

How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!


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!