Notion Definition: The Word's Meaning and the Notion App Explained

A notion is an idea, belief or impression of something, often one that is vague or not fully thought through, as in “I had no notion of what was happening.” If you meant Notion the app, it is a workspace tool that combines notes, documents, wikis, projects and databases, built from flexible pieces called blocks.

Because the search “notion definition” covers both, this guide explains the word first and then the software, including the handful of terms (workspace, page, block, database) that confuse most new users.

The dictionary definition of “notion”

The major dictionaries agree on a core meaning and a few secondary ones. Merriam-Webster defines it as an individual’s conception or impression of something known, experienced or imagined. The Cambridge Dictionary puts it more simply: a belief or idea.

Here are the main senses you will run into:

How “notion” differs from “idea” and “concept”

These words are close, but they carry different weight. Merriam-Webster’s synonym notes say a notion suggests an idea not much resolved by analysis or reflection, and it may suggest the capricious or accidental. In practice:

• Idea is the neutral, all-purpose word.
• Concept sounds more formal and worked out, as in an academic or design concept.
• Notion often sounds tentative, personal, or slightly dismissive, as in “the notion that…” when a writer is about to challenge a claim.

That last pattern is worth noticing. Phrases like “the notion that remote work kills productivity” usually signal that the writer thinks the claim is questionable.

Common phrases

• “Have no notion” / “not have the faintest notion”: to have no idea at all.
• “Have (or take) a notion to do something”: to feel like doing something. Cambridge lists this as a separate idiom entry.
• “The very notion”: used to stress how surprising or absurd an idea is.

The sewing sense

If you saw “notions” on a sign in a fabric or craft store, it is not about ideas. In American English, notions are small sewing items like pins, thread and buttons. Cambridge adds that the word can also refer to the shop or department that sells them, which British English usually calls haberdashery.

Where the word comes from

According to Etymonline, “notion” comes from Latin notio, formed from noscere, “to come to know”, which traces back to the Proto-Indo-European root meaning “to know”. Etymonline says Cicero coined notio as a loan-translation of Greek philosophical terms such as ennoia (“conception”).

The same root gives English notice and notorious (originally “publicly known”).

The meaning drifted over time. Etymonline dates the sense “an opinion, a view, a somewhat vague belief” to around 1600 and the “whim” sense to at least 1746.

Sources differ slightly on when the word entered English. Etymonline places it in the late 1300s, while Merriam-Webster gives a first known use of 1531. Dictionaries date first uses from the earliest records they have found, so these dates can differ and may be revised.

Notion the app: what it is

Notion is a productivity and collaboration tool made by Notion Labs. Its own product pages describe it as a connected workspace that brings docs, wikis, projects and databases together in one place. As of October 2026, its marketing leans heavily on AI and describes it as a collaborative AI workspace. Treat those descriptions as the company talking about itself rather than as independent assessments.

Notion runs in a web browser and has desktop and mobile apps. Get them only from notion.com or your device’s official app store.

Key Notion terms, defined

Most confusion with Notion comes from its vocabulary. Everything nests inside everything else, so it helps to learn the four core terms from the bottom up.

Block

Notion’s block basics guide says everything on a Notion page is a block. That includes text, images, headings, to-do items and embedded databases. You can drag blocks around to rearrange a page without any code.

Page

A page is a block that holds other blocks. Pages can contain sub-pages, and you can nest them as deeply as you like. That is how people build things like a team handbook with a chapter on each sub-page.

Database

According to Notion’s intro to databases, a database is a block for structured information. You can view it as a table, board, list and other layouts. It can be a full page of its own, or it can sit inline on a page next to other content. Every entry (row) in a database is also a page, so you can open it and add notes, files or more blocks.

Workspace

The workspace is the container for everything. Its sidebar is how you get around, and the pages and databases you create appear there. One account can belong to several workspaces, which is a common way to keep personal and work material apart.

How the pieces fit together

Getting oriented in Notion

If you came here because you just started using Notion, this order works well:

1. Create one page and type into it. Notice that each paragraph, heading or checklist item is its own block that you can drag around.
2. Add a sub-page inside it to see how nesting works in the sidebar.
3. Add a simple database, such as a task table, then switch it to a board view. You are changing how the same data looks, not copying it.
4. Open one database entry as a page to see that each row can hold its own notes.
5. Check sharing settings before inviting others. Notion’s help center has a separate guide to sharing and permissions.

Notion’s features, plans and AI tools change often. Check the Notion help center for the current details rather than relying on older tutorials.

The short version

• notion (noun): an idea, belief or impression, often a vague or not fully reasoned one. Informally, it can also mean a whim.
• notions (plural, US): small sewing supplies.
• Notion (proper noun): a workspace app that combines pages, databases and documents, all built from blocks.

Context almost always makes clear which one you mean. A lowercase “notion” in a sentence is the word, and a capitalized “Notion” next to words like “page”, “template” or “workspace” is the app.