noun (1)
\ ˈās How to pronounce ace (audio) \

Definition of ace

 (Entry 1 of 7)

1a : a die face marked with one spot
b : a playing card marked in its center with one pip
c : a domino end marked with one spot
2 : a very small amount or degree : particle
3 : a point scored especially on a service (as in tennis or handball) that an opponent fails to touch
4 : a golf score of one stroke on a hole also : a hole made in one stroke
5 : a combat pilot who has brought down at least five enemy airplanes
6a : a person who excels at something a computer ace
b : the best pitcher on a baseball team the ace of the staff
ace in the hole
1 : an ace dealt face down to a player (as in stud poker) and not exposed until the showdown
2 : an effective and decisive argument or resource held in reserve
within an ace of
: on the point of : very near to came within an ace of winning


aced; acing

Definition of ace (Entry 2 of 7)

transitive verb

1 : to score an ace against (an opponent)
2 : to make (a hole in golf) in one stroke
3 : to gain a decisive advantage over : defeat usually used with out
4a : to earn a high grade on (something, such as an examination) especially : to get an A on
b : to perform extremely well in he aced every subject

Definition of ace (Entry 3 of 7)

: of first or high rank or quality an ace mechanic


noun (2)
plural aces

Definition of ace (Entry 4 of 7)

: an asexual person (see asexual sense 3b) Like many other aces and aros, I grew up thinking I was broken. I was 19 before I heard the words "asexual" or "aromantic," before I found out that there were other people in the world like me.— Mikayla Micomonaco

Definition of ace (Entry 5 of 7)

: asexual But ace individuals often still feel romantic attraction toward others, as well as a drive to cultivate intimate, loving relationships—just without an intrinsic interest in pursuing the sexual aspect.— Taryn Deoilers



Definition of Ace (Entry 6 of 7)

used for a bandage with elastic properties

Definition of ACE (Entry 7 of 7)

1 American Council on Education
2 \ ˌā-​(ˌ)sē-​ˈē How to pronounce ACE (audio) , ˈās-​ \ angiotensin converting enzyme The ACE inhibitors are designer molecules developed specifically to attach to their target enzyme and prevent it from activating angiotensin. Virtually the only thing these drugs do in the body is to interact with ACE. However, ACE is not a very specific enzyme; it acts on hormones besides angiotensin.Harvard Medical Health Letter

Keep scrolling for more

Examples of ace in a Sentence

Noun (1) She won the match by scoring more than 30 aces. took a few lessons with a tennis ace to improve his backhand Verb She aced her entrance exams. He aced his annual physical. He aced his opponent on the last point of the match.
See More
Recent Examples on the Web: Noun Oregon gave Robert Ahlstrom some early run support, but the Ducks ace got tagged in the middle innings in a series-opening loss at USC. James Crepea | The Oregonian/oregonlive, oregonlive, "Oregon baseball drops series opener at USC," 16 Apr. 2021 The Mets ace is 0-1 this year despite allowing just one run in 14 innings, striking out 21 with two walks. Creg Stephenson |, al, "Mets-Phillies MLB 2021 live stream (4/15): How to watch online, TV info, time," 15 Apr. 2021 The Blue Jays ace retired 12 in a row after DJ LeMahieu had a leadoff infield single in the first. Mark Didtler,, "Ryu sharp into 7th, Semien homers as Blue Jays top Yanks 7-3," 13 Apr. 2021 The Blue Jays ace retired 12 in a row after DJ LeMahieu had a leadoff infield single in the first. Mark Didtler, Star Tribune, "Ryu sharp into 7th, Semien homers as Blue Jays top Yanks 7-3," 13 Apr. 2021 Fleetwood finished the day with four bogeys, the ace and shot a 2-over 74. Tim Reynolds, San Francisco Chronicle, "Stephen Curry helps PGA celebrate Lee Elder, diversity," 8 Apr. 2021 Fleetwood finished the day with four bogeys, the ace and shot a 2-over 74. Tim Reynolds, ajc, "Fore, dad! McIlroy sends errant Masters shot off his father," 8 Apr. 2021 Horn might not be able to live up to Patrick Peterson's legacy in the desert, but the sticky coverage ace could shore up an undermanned secondary. Michael Middlehurst-schwartz, USA TODAY, "NFL mock draft 2021: Sam Darnold trade reshuffles QB outlook in top 10," 7 Apr. 2021 There is pitcher Gerrit Cole, the ace who will start opening day on Thursday against the Toronto Blue Jays. New York Times, "Pitchers Beware: Giancarlo Stanton Is Feeling Strong," 31 Mar. 2021 Recent Examples on the Web: Verb Phillies ace Aaron Nola lasted only four innings, pitching out of trouble the final two. Rob Maaddi, Star Tribune, "Bohm, Realmuto hit 3-run homers, Phillies beat Mets 8-2," 7 Apr. 2021 DiMare, this week, announced junior Daniel Federman, who has been a closer and setup man the past two seasons, as his Friday ace with standout freshmen Alejandro Rosario and Victor Mederos to follow him on Saturdays and Sundays. David Furones,, "UM baseball looks to flip recent history vs. Florida — this time, to open the season," 18 Feb. 2021 In the first year of a two-year free-agent deal, Chacín emerged as the Brewers ace in ’18, going 15-8 with a 3.50 ERA in a league-high 35 starts. Tom Haudricourt, Milwaukee Journal Sentinel, "Brandon Woodruff ends 'curse of opening day starter' by getting second assignment for Brewers," 18 Mar. 2021 Mets ace Dwight Gooden was on the mound and cruising. Los Angeles Times, "The greatest moments in Dodgers history, No. 25: Mike Scioscia’s NLCS homer," 23 Feb. 2021 Kelenic was comforted by not only most of his teammates, but a bevy of powerful voices throughout the game, everyone from the players union to Minnesota Twins third baseman Josh Donaldson to New York Yankees ace Gerrit Cole and manager Aaron Boone. Bob Nightengale, USA TODAY, "Seattle Mariners prospect Jarred Kelenic says team is punishing him for refusing to sign contract extension," 24 Feb. 2021 Two other Padres players — former Cubs ace Yu Darvish and Eric Hosmer — have deals worth more than $120 million. Paul Sullivan,, "Cactus League report: Jed Hoyer says Cubs have no deadline for deals with impending free agents — and Yoan Moncada is eager to show off his speed for the White Sox," 4 Mar. 2021 Hill began last season as a special teams ace, then gradually saw his role increase on the back end of the defense. Orion Sang, Detroit Free Press, "Michigan football's Dax Hill called perhaps best cover guy in Big Ten by Don Brown," 30 Sep. 2020 His challenge this season will be to duplicate that impact for the Wild while under the watchful eye of his competition — a test Fiala is eager to ace. Sarah Mclellan, Star Tribune, "Wild's top scorer Kevin Fiala knows he'll have to stay disciplined as opponents target him," 9 Jan. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ace.' 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 ace

Noun (1)

14th century, in the meaning defined at sense 1a


1923, in the meaning defined at sense 1

Adjective (1)

1926, in the meaning defined above

Noun (2)

2008, in the meaning defined above

Adjective (2)

2009, in the meaning defined above

History and Etymology for ace

Noun (1)

Middle English as, borrowed from Anglo-French, going back to Latin ass-, ās "copper money piece (at first a pound, but progressively reduced to a half-ounce), pound unit of weight, unit," of uncertain origin

Note: The word ās has been compared within Latin to asser "wooden beam, pole, post" (generalized from a plural asserēs, from a singular *assis?) and assis, axis (by hypercorrection?) "plank, board," though any relationship is far from certain. A loanword from Etruscan?

Adjective (1)

derivative of ace entry 1

Keep scrolling for more

Learn More about ace

Time Traveler for ace

Time Traveler

The first known use of ace was in the 14th century

See more words from the same century

Statistics for ace

Last Updated

25 Apr 2021

Cite this Entry

“Ace.” Dictionary, Merriam-Webster, Accessed 6 May. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

More Definitions for ace



English Language Learners Definition of ace

US, informal : to earn a very high grade on (an examination) : to get a grade of A on (an examination) : to perform very well on (a test or challenge)
: to score an ace against (an opponent in tennis)
US : to score an ace on (a hole in golf)


\ ˈās How to pronounce ace (audio) \

Kids Definition of ace

 (Entry 1 of 2)

1 : a playing card with one figure in its center
2 : expert entry 2 a flying ace



Kids Definition of ace (Entry 2 of 2)

: of the very best kind an ace reporter


\ ˈās How to pronounce Ace (audio) \

Medical Definition of Ace

 (Entry 1 of 2)

used for a bandage with elastic properties

Medical Definition of ACE (Entry 2 of 2)

Keep scrolling for more

More from Merriam-Webster on ace

Thesaurus: All synonyms and antonyms for ace

Nglish: Translation of ace for Spanish Speakers

Britannica English: Translation of ace for Arabic Speakers

Comments on ace

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


Test Your Vocabulary

Star Wars Words Quiz

  • cu jedi training
  • The bounty portion of bounty hunters (such as Boba Fett) comes from a Latin word meaning
Name That Thing

Test your visual vocabulary with our 10-question challenge!


Anagram puzzles meet word search.

Love words? Need even more definitions?

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