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Technical Vocabularynoun · /ˈdeɪtəˌsɛt/

dataset

In simple English

In tech workplaces, a dataset is a fundamental concept across multiple domains. Data scientists use datasets to train and evaluate machine learning models, quality assurance engineers use them to test applications, and analysts use them to identify trends and patterns. Datasets can be small (hundreds of records) or very large (millions or billions). They are typically stored in formats like CSV, JSON, or SQL tables and can be sourced from user activity, sensors, transactions, or public repositories. When teams talk about cleaning a dataset, they mean preparing it by removing errors, handling missing values, and standardizing formats before analysis begins.

Understanding what a dataset is and how it is used in software development, machine learning, and data analysis.

At a glanceCEFR B2
Commonness5/5
Versatility5/5
FormalityCasualFormalNeutral
Spoken ↔ WrittenSpokenWrittenBoth
Directness ↔ DiplomaticDirectDiplomaticDirect
RegionUS and UK
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Say it like this

✓We are working with a clean dataset for the experiment.
✓This dataset contains user behavior from the past quarter.
✓Let us split the dataset into training and testing portions.

Real examples

in a standup

"We received the customer dataset yesterday, so we can start building the analytics pipeline today."

in a code review

"Make sure to validate the dataset before running it through the preprocessing function."

in a team meeting

"The machine learning team needs a labeled dataset with at least 10,000 samples to improve model accuracy."

Don't say this

Handle with care. Do not confuse dataset with database. A dataset is a collection of data points, while a database is a system for storing and managing data.

✕We stored the dataset in the database.
✓We imported the dataset into the database.— Datasets are imported or stored within databases; they are not stored as databases themselves.
✕The dataset system crashed.
✓The database system crashed.— Dataset refers to data itself, not a system. Use database when referring to the storage system.
✕Can you send me a dataset?
✓Can you send me the dataset?— In tech contexts, use the definite article when referring to a specific, known dataset.

Other forms

noun

dataset

"The dataset contains 50,000 product reviews."

noun

datasets

"We are combining three datasets to improve our analysis."

adjective

dataset-driven

"We use a dataset-driven approach to decision making."

Often used with

clean datasetA dataset that has been processed and validated, free from errors and inconsistencies.
labeled datasetA dataset where data points have been tagged with correct answers, used for supervised machine learning.
training datasetThe portion of data used to train a machine learning model.
large datasetA dataset containing a significant volume of records, often millions or billions of data points.
split the datasetTo divide data into separate portions, typically for training, validation, and testing.

Similar words

data collectionMore general term; dataset implies organized, structured data.
corpusUsed specifically in linguistics and NLP; refers to a large collection of text or language data.

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. You need to prepare data for a machine learning project. What do you say?

Complete the sentence

2. The machine learning model performs better when we use a _______ dataset with clear labels.

Spot the mistake

3. Which sentence uses dataset incorrectly?

Rewrite naturally

4. Rewrite in natural tech English: The information we are using for our machine learning project is very large and comes from customer interactions.

Questions

Quick poll

Have you said "dataset" in a standup this week?

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