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

Soccer journalist Andrew Wiebe will moderate a panel discussion exploring how data is transforming the sport at this free event. —Dan Kelly march 29, Kansas City Star, 29 Mar. 2026

In a deposition used in the Watson trial, Carol Lynn Berseth — a co-author of the paper and Mead Johnson’s director of medical affairs for North America when the study was completed — testified that the article was peer-reviewed and that no reviewer asked for additional data. —David Hilzenrath, USA Today, 29 Mar. 2026

Iran also is targeting data centers with both cyber and conventional weapons, showing how important the centers have become to the economy, communications and military information security. —ABC News, 29 Mar. 2026

Fuel efficiency drops quickly above about 50 mph, The Points Guy recently reported, and federal data shows aggressive driving can cut gas mileage by up to 40% in stop-and-go traffic. —Deirdre Bardolf, FOXNews.com, 28 Mar. 2026

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