mi·​cro | \ ˈmī-(ˌ)krō How to pronounce micro (audio) \

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

The micro leather and suede box bag is available to shop in a number of shades and finishes. Amy Mackelden, Harper's BAZAAR, "Kate Middleton Visits Blackpool in the Pouring Rain Wearing Michael Kors," 6 Mar. 2019 But that required the purchase of a 512GB micro SD card, which can be expensive (check out Gordon Mah Ung’s SD card shopping advice). Michael Simon, PCWorld, "10 Samsung Galaxy S10, S10e, and S10+ features that actually surprised us," 20 Feb. 2019 But on a more micro level, our disgust sensitivity is also shaped by family environments, norms within our smaller social circles, and our own daily routines and private behaviors. Cari Romm, The Cut, "What Your Ability to Handle Pimple-Popping Videos Says About You," 11 July 2018 Micro Plastics Arianna García Chamero, who works at the Cienfuegos Center for Environmental Studies, set off alarms when local researchers reported finding micro plastics in the bay. Mario J. Pentón, miamiherald, "Pollution is destroying the environment and livelihood for residents in this Cuban city," 7 June 2018 Aquarians should remember that progress always starts on a micro level, advocating empathy and compassion wherever possible. Aliza Kelly Faragher, Allure, "The Personality of an Aquarius, Explained," 2 Feb. 2018 One Night Only Bangs Sideswept, choppy or micro, bangs proved to be one of the year's instant hits. Jenna Rennert, Vogue, "10 Beauty Trends That Broke The Internet in 2018," 6 Dec. 2018 The restaurant’s flat bread, grilled over hot embers, proves the perfect vehicle for a topping of hummus, cucumber, feta and micro-arugula from its green houses. Jeanmarie Brownson, chicagotribune.com, "What to put on toast when you're done with avocados," 18 Apr. 2018 The classic lace-up skate shoe features a fresh twist on the legendary Vans print that mixes both micro and macro checkerboard patterns. Tyler Watamanuk, GQ, "Vans Classic Checkered Sneakers Just Got a 2018 Upgrade," 14 Feb. 2018

Recent Examples on the Web: Noun

The proposal itself was a total surprise; my fiance, Tom, spent four months planning it so that every single micro-detail was customized to reflect us and our relationship. Kaye Toal, SELF, "I'm Fat and I'm Not Going to Lose Weight for My Wedding," 1 Mar. 2019 For baby gifts, check out FORAI (Friends of Refugees and Immigrants), a nonprofit that sells the cutest onesies, all of which help the artisans sustain sewing micro-businesses. Jane Mosbacher Morris, Marie Claire, "5 Easy Ways to Use Your Wallet to Create Real Change," 31 Jan. 2019 The tiers are highly debated, but basically a micro-influencer is really anyone who doesn’t have an agent or representation yet. Ashley Carman, The Verge, "Who’s your Instagram boyfriend?," 14 Nov. 2018 The battery compartment is sealed, rechargeable via micro USB, as with others, a nice feature. Andrew Northshield, Popular Mechanics, "A Former Marine Tests the Best Headlamps," 6 Nov. 2018 Amandla's words refer to the racist micro-aggression of assuming all people of a certain race look alike. Allie Gemmill, Teen Vogue, "Amandla Stenberg Called Out the Racist Idea That Black People "All Look the Same"," 10 Oct. 2018 Having a sense of gratitude often helps me out of the ‘travel is a burden’ self-talk that can cause the inevitable micro-struggles of travel to appear more dramatic. Annie Daly, SELF, "16 Ways to Stay Mentally Healthy When You Travel A LOT, From People Who Do It," 6 Dec. 2018 The company has already won contracts with the Department of Defense and Sitael, an Italian micro-satellite manufacturer, among others. Sam Blum, Popular Mechanics, "Virgin Orbit Flies Converted 747 With Rocket Attached to Its Wing For First Time," 19 Nov. 2018 Both CPUs are based on the company's latest 2nd=generation Zen+ micro-architectures, built on a 12nm process. Gordon Mah Ung, PCWorld, "AMD's Ryzen 5 2500X and Ryzen 3 2300X target budget gamers, but they're not DIY," 10 Sep. 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

17 Mar 2019

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 How to pronounce micro (audio) \

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).


a shady place in a garden or forest

Get Word of the Day daily email!

Test Your Vocabulary

Original Meanings Quiz

  • rembrandt-painting-a-young-scholar-and-his-tutor
  • Which of the following is the earliest known sense of the word awe?
Spell It

Can you spell these 10 commonly misspelled words?

Word Winder's CrossWinder

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!