In principle means in general, as an idea: we agree in principle, so the idea is fine but the details are still open. It's a yes without a signature on specific terms. The second meaning is a theoretical possibility: in principle, any member can lead a workshop.
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agree or approve + in principle / In principle, + general possibility
- We support the extension in principle, but the entrance still needs redesigning.
- The committee agreed in principle to share the equipment.
- In principle, any member can lead a workshop if a suitable room is available.
What changed
First versionThe residents accepted the proposal in principal.
RevisionThe residents accepted the proposal in principle.
Principle and principal sound exactly the same, and even native speakers mix them up in writing. Principal means main, or the head of a school; principle means a rule or idea. This phrase needs the idea: in principle.
On principle means because of your beliefs: I don't eat fast food on principle. That's a firm position, while in principle is a soft, early yes. One preposition turns basically yes into a stubborn no.
Your turn
Choose the word for general agreement before details are settled: We have agreed in ___.
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principle — General agreement uses principle, the idea. Principal is a different word that only sounds the same.
Support a proposal in general but leave one specific question open. Use agree in principle.
I agree in principle to moving the meeting, but we need a time that suits the evening staff.
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