Force Dictionary to Use One Window? Fixes
This article explains how to make the Dictionary app on macOS open every lookup in a single window instead of spawning new ones, and it covers the related issue where the dictionary pop-up keeps reopening. The fix involves adjusting System Settings (or System Preferences on older macOS) and using the app’s own preferences, with a few extra steps if the problem persists.
Why Dictionary Opens Multiple Windows
On macOS, the Dictionary app is designed to open a new window each time you trigger a lookup from another app (like Safari, Mail, or Pages) using the “Look Up” feature or a keyboard shortcut. This is default behavior, not a bug. The app treats each lookup as a separate request, and unless you explicitly merge windows or change a setting, each one appears as its own window. Some users find this cluttered, especially when researching a word repeatedly. The good news is that you can change this behavior with a simple setting.
The Core Fix: Disable “Open in New Window”
In recent macOS versions (Ventura and later), the Dictionary app’s preferences include an option that controls window behavior. Here’s how to set it:
- Open the Dictionary app (you can find it in the Applications folder, or by searching with Spotlight).
- From the menu bar at the top, click Dictionary and then Settings (or Preferences on older macOS).
- Look for the option labeled “Open in new window” or similar. In some versions, it’s under the “General” tab.
- Uncheck that box. Now lookups from other apps will reuse the existing Dictionary window, bringing it to the front.
If you don’t see that checkbox, your macOS version might handle it differently. On older systems (Mojave through Monterey), the setting is in the same place, but the wording may be “Open in a new window” or “Use separate windows for each lookup.” The principle is the same: uncheck it.
If the Setting Isn’t There or Doesn’t Work
Sometimes the checkbox doesn’t appear, or the problem persists. This can happen if you’re using an older macOS version or if the app’s preferences are corrupted. Here’s what to try:
- Check for macOS updates: Apple occasionally changes settings locations. Go to System Settings > General > Software Update.
- Reset the Dictionary app’s preferences: Quit Dictionary, then delete the file
com.apple.Dictionary.plistin~/Library/Preferences/. Restart the app. This resets all settings to default, so you’ll need to re-enable your preferred dictionaries. - Use the “Window” menu: Even with the setting off, you can manually merge windows by going to Window > Merge All Windows in the menu bar. This combines all open Dictionary windows into one with tabs.
- Use tabs instead: If you prefer a single window with multiple tabs, you can set Dictionary to open links in tabs. In System Settings > Desktop & Dock, under “Windows,” set “Prefer tabs when opening documents” to “Always.” This makes new lookups open as tabs in the existing window, not separate windows.
How the Look Up Feature Works
The “Look Up” feature (often triggered by force-clicking a word or selecting it and right-clicking) is separate from the Dictionary app itself. It shows a small popover with a definition. If you click “Open in Dictionary” in that popover, it opens the Dictionary app. The behavior of that app is what we’re controlling. If you want to avoid the popover altogether, you can turn off Look Up in System Settings > Trackpad (or Mouse) > Look Up & Data Detectors. But that’s a different setting.
Common Problems and Misconceptions
A frequent misconception is that the Dictionary app is broken or that a third-party tool is needed. In reality, the setting is just buried. Another common issue: the checkbox is grayed out. That usually means the app is in a state where it can’t change the setting (e.g., a modal dialog is open). Close all dialogs and try again. Also, note that the setting applies to the app’s behavior, not to the Look Up popover itself. The popover will still appear; only the main app’s window behavior changes.
Alternative Solutions and Workarounds
If the setting still doesn’t work, consider these alternatives:
- Use a third-party dictionary app: Apps like WordWeb or Eudic have their own window management, but they may not integrate with macOS Look Up.
- Use the terminal: You can use the command
defaults write com.apple.Dictionary OpenInNewWindow -bool NOto force the setting. This is a more direct approach if the GUI is unresponsive. - Use the web: Instead of the app, use a browser tab for dictionary.com or a similar site. This avoids the app entirely.
Frequently Asked Questions
Why does Dictionary keep opening a new window every time I look up a word?
This is the default behavior in macOS. The app is designed to show each lookup in a fresh window unless you change the “Open in new window” setting in Dictionary’s preferences. Uncheck that box, and it will reuse the existing window.
Where is the Dictionary settings option?
Open the Dictionary app, then click “Dictionary” in the menu bar (top left of your screen) and select “Settings” (or “Preferences” on older macOS). The option is under the General tab. If you don’t see it, your macOS version might be very old; try resetting the app’s preferences as described above.
Can I make Dictionary open in tabs instead of windows?
Yes. In System Settings > Desktop & Dock, under “Windows,” set “Prefer tabs when opening documents” to “Always.” Then, when you open a new lookup, it will appear as a tab in the existing Dictionary window instead of a new window.
Why is the “Open in new window” checkbox grayed out?
This usually happens when the Dictionary app is in a state where it can’t change settings, such as when a dialog box is open. Close any open dialogs, then try again. If it’s still grayed out, quit the app and reopen it.
Does this setting affect the Look Up popover?
No. The Look Up popover (the small window that appears when you force-click a word) is separate from the Dictionary app. The setting only controls how the full Dictionary app behaves when you click “Open in Dictionary” in that popover.
What if I’m using an older macOS version like Mojave?
The setting is still there, but it might be under “Preferences” instead of “Settings.” The checkbox is labeled “Open in new window” or similar. If you can’t find it, reset the app’s preferences file as described above.
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