arbiter

noun

ar·​bi·​ter ˈär-bə-tər 

1

: a person with power to decide a dispute : judge

The mayor will act as the final arbiter in any dispute between board members.

2

: a person or agency whose judgment or opinion is considered authoritative

arbiters of taste

Did you know?

Are arbiter and arbitration arbitrary?

A large portion of the words we use today come from Latin roots. Many of these words retain a meaning that is closely related to their Latin ancestor, although sometimes they will drift a considerable distance from their roots (sinister, for instance, had the meaning of “on the left side” in Latin, but also meant “unlucky, inauspicious”). In some instances, a single Latin word will give rise to multiple words in English, some of which have strayed in meaning, and others which have not.

An example of this may be found in our word arbiter. We trace it to the Latin root with the same spelling, arbiter, meaning “eyewitness, onlooker, person appointed to settle a dispute.” A number of English words stem from the Latin arbiter, many of which have to do with judging or being a judge. An arbiter is a judge, and arbitration is the act of judging, or serving as an arbiter. Yet the most common meaning of arbitrary is “existing or coming about seemingly at random or by chance or as a capricious and unreasonable act of will,” which seems to be quite a bit different in meaning from the other two words. Arbitrary does indeed come from the same Latin root, and its oldest meaning in English was “depending on choice or discretion particularly regarding the decision of a judge or a tribunal.” But over time it developed additional senses that are somewhat removed from that initial meaning.

Synonyms

• referee
• judge
• umpire
• arbitrator

Examples of arbiter in a Sentence

Recent Examples on the Web

Additionally, the parliamentarian, who is the Senate’s chief arbiter of its often complicated rules, advised against various GOP provisions barring certain immigrants from health care programs. —Emma Burleigh, Fortune, 27 June 2025

Ultimately, an arbiter found that AV’s bookkeeping left something to be desired but that there wasn’t enough evidence to find Nicole, her boyfriend or the other co-defendants liable. Littleton, meanwhile, had been embroiled in an animal rescue lawsuit. —John McDermott, HollywoodReporter, 19 June 2025

The Role Of Diverse Teams In Shaping Taste Marketers often position themselves as arbiters of taste, curating experiences and narratives that align with consumer preferences. —Sean Dallaskidd, Forbes.com, 16 June 2025

The Congressional Budget Office, the government's nonpartisan arbiter of tax and spending matters, says the One Big Beautiful Bill, passed by the House last month and now under consideration in the Senate, would increase federal budget deficits by $2.4 trillion over the next decade. —Arkansas Online, 8 June 2025

Word History

Etymology

Middle English arbitour, arbitre, borrowed from Anglo-French, borrowed from Latin arbiter "eyewitness, onlooker, person appointed to settle a dispute," perhaps, if going back to *ad-biteros, from ad- ad- + *-biteros, derivative from a base *-bit- akin to bītere, baetere, bētere "to go," of obscure origin

First Known Use

14th century, in the meaning defined at sense 1

Phrases Containing arbiter

• arbiter elegantiarum

Kids Definition

arbiter

noun

ar·​bi·​ter ˈär-bət-ər 

1

: arbitrator

2

: a person whose judgment or opinion decides what is right or proper

an arbiter of taste

Legal Definition

arbiter

noun

ar·​bi·​ter ˈär-bə-tər 

: arbitrator

Etymology

Latin, onlooker, arbitrator