datum

noun

da·​tum ˈdā-təm  ˈda- 

ˈdä-

1

plural data ˈdā-tə  ˈda- 

also

ˈdä-  : something given or admitted especially as a basis for reasoning or inference

an important historical datum

This enormous expense—and considerable risk—to pick up a datum or two about geriatrics?

—Charles Krauthammer

2

plural datums, mathematics : something used as a basis for calculating or measuring

measuring the distance between datum points

… make things more efficient for those of us whose work requires a time datum.

—Robert Steinbrunn

Is data singular or plural?: Usage Guide

Data comes from the plural of datum, a technical word that refers to a single piece of information. Data continues to function as a plural, especially in technical and formal writing, taking a plural verb and plural modifiers (such as these, many, a few).

The data are compelling.

These data are incorrect.

More data are needed.

As for the data currently available, they are inconclusive.

More commonly, however, data refers to masses or collections of pieces of information, and functions much like the word information itself, taking a singular verb and singular modifiers (such as this, much, little).

The data is compelling.

Little data is available.

That data is flawed.

Is this data accurate?

As for the data we've seen, it's inconclusive.

Both constructions are standard.

Synonyms of datum

• fact
• detail

Examples of datum in a Sentence

let's begin our discussion of this matter with a datum from actual experience

Recent Examples on the Web

By Fortune’s estimates, drawn from industry data, the value of all direct deals, using the broad definition of single investments in private companies, will explode to something like $200 billion this year, multiple the number several years ago. —Shawn Tully, Fortune, 1 Nov. 2025

To review or object to instances where our partners assert a legitimate interest in utilizing your data, please visit our vendors page. —Jazz Monroe, Pitchfork, 31 Oct. 2025

Tossed and battered by violent wind and severe turbulence, the National Oceanic and Atmospheric Administration’s Hurricane Hunters have spent the past week diving into the eye of Melissa — a storm of historic ferocity — to gather life-saving data. —Andrew Freedman, CNN Money, 31 Oct. 2025

The data also helps with fresh iterations of a shoe, as well as plays a role in ideating new models, with each predecessor becoming the benchmark for the next one. —Vicki M. Young, Footwear News, 31 Oct. 2025

Word History

Etymology

Latin, from neuter of datus

First Known Use

1646, in the meaning defined at sense 1

Phrases Containing datum

• sense-datum

Rhymes for datum

• atom
• stratum
• erratum
• striatum
• substratum
• heteroatom
• petrolatum

Kids Definition

datum

noun

da·​tum ˈdāt-əm  ˈdat- 

ˈdät-

plural data -ə  or datums

: something used as a basis for reasoning or arriving at a conclusion or for calculating or measuring