All 6 Uses

principle
in
White: The Great Pursuit
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Perhaps if they follow Justin in principle, he wouldn't require that they actually drown.†
Chpt 2

principle = basic rule or belief
They're still principled.†
Chpt 7 *

principled = with or based on basic beliefs
I understand principle.†
Chpt 9

principle = basic rule or belief
He's convinced that France won't deliver the antivirus as promised, and he's decided as a matter of principle to go down in flames.†
Chpt 20
We can't allow one man to sacrifice our survival over his own inflated notions of principle!†
Chpt 29
He didn't care that she had stood up for principle or that she'd done what was right.†
Chpt 43

Definitions:

(1) (principle)
a basic rule or belief
The exact meaning of principle can depend upon its context. For example:
- "our guiding principles" -- basic moral beliefs that guide decisions and behavior
- "electromagnetic principles" -- rules describing how the world works
- "She lacks principles." -- lacks moral guidelines
- "We agree in principle." -- about important basic beliefs
(2) (meaning too rare to warrant focus)
See a comprehensive dictionary for more specialized senses including one in chemistry.