Datum Meaning

/ˈdeɪtəm/ or /ˈdɑːtəm/ Part of speech: Noun Origin: Latin (from the past participle of "dare," meaning "to give") Category: Words & Vocabulary
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Quick Answer

A datum is a single piece of information or fact, typically quantifiable, used as a basis for calculation, discussion, or analysis. The word is the singular form of "data" and represents one unit of recorded observation or measurement in research, statistics, or computing contexts.

What Does Datum Mean?

Core Definition

A datum is fundamentally a single element of information. While "data" has become increasingly common as both singular and plural in modern usage, technically "datum" remains the grammatically correct singular form. Each datum represents one discrete observation, measurement, or fact collected during research or analysis.

Historical Context and Evolution

The term entered English through scientific and mathematical discourse in the 17th century, borrowed directly from Latin. In its original Latin context, "datum" meant "something given"—emphasizing the idea that information is a given fact to work with. For centuries, scholars, statisticians, and scientists adhered strictly to the datum/data distinction, with "datum" appearing regularly in academic papers and technical writing.

However, the digital revolution transformed language use. As computing and data science accelerated in the late 20th century, the boundaries between singular and plural usage became increasingly blurred. Today, "data" is frequently used as a mass noun (like "information"), which has reduced the everyday usage of "datum" in casual contexts. Nevertheless, the term remains formally correct and appears in academic writing, formal statistical reports, and technical documentation.

Modern Usage and Significance

In contemporary contexts, a datum typically refers to:

  • A single numerical value in a dataset
  • One response in a survey or questionnaire
  • An individual measurement from an experiment
  • A single coordinate or point in spatial data analysis

The distinction between datum and data remains important in fields prioritizing precision, including statistics, research methodology, scientific publishing, and formal data science work. Understanding this distinction helps communicate clearly about the granularity of information being discussed.

Practical Applications

When discussing research results, specifying "a datum" versus "data points" can affect how findings are perceived. A single datum may be considered insufficient evidence, while accumulated data (multiple datum) can establish patterns. In data analysis, recognizing individual datum values allows researchers to identify outliers, anomalies, or exceptional cases that might be obscured when discussing aggregate data.

Key Information

Context Typical Usage Singular Form Plural Form
Academic Research Formal/Technical Datum Data
Scientific Studies Technical Datum Data
Casual Conversation Informal Data point Data
Statistics Formal Datum Data
Computing Mixed Datum/Data point Data

Etymology & Origin

Latin (from the past participle of "dare," meaning "to give")

Usage Examples

1. Each datum collected from the survey was carefully recorded and coded before statistical analysis began.
2. The researcher noticed that one datum appeared to be an outlier and warranted further investigation.
3. Without a single reliable datum, the entire hypothesis remained untestable.
4. The quality of conclusions depends on the accuracy of every datum entered into the database.

Frequently Asked Questions

Is "datum" still used in modern English?
Yes, though less frequently than in earlier decades. It remains the grammatically correct singular form and appears regularly in academic papers, technical documentation, and formal statistical reporting.
What's the difference between "datum" and "data"?
Datum is singular (one piece of information), while data is plural (multiple pieces of information). However, "data" is increasingly used as a mass noun in modern English, making the distinction less rigorous in casual usage.
Can I use "data" as singular?
In modern informal English, yes—many people use "data" for both singular and plural contexts. However, formal academic and technical writing typically maintains the datum/data distinction for precision.
What's another word for a single datum?
"Data point" is a common modern alternative that clearly indicates a single piece of information without relying on the formal datum/data distinction.
Where would I encounter the word "datum" in everyday life?
You'd see it primarily in academic papers, research reports, statistical analyses, scientific documentation, and formal data science publications rather than in casual conversation.

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