All 6 Uses of

principle
in
Gulliver's Travels

For, since the conjunction of male and female is founded upon the great law of nature, in order to propagate and continue the species, the Lilliputians will needs have it, that men and women are joined together, like other animals, by the motives of concupiscence; and that their tenderness towards their young proceeds from the like natural principle: for which reason they will never allow that a child is under any obligation to his father for begetting him, or to his mother for bringing him into the world; which, considering the miseries of human life, was neither a benefit in itself, nor intended so by his parents, whose thoughts, in their love encounters, were otherwise employed.†
Chpt 1

principle = basic rule or belief

They are bred up in the principles of honour, justice, courage, modesty, clemency, religion, and love of their country; they are always employed in some business, except in the times of eating and sleeping, which are very short, and two hours for diversions consisting of bodily exercises.†
Chpt 1 *

principles = basic rules or beliefs

He said, "that new systems of nature were but new fashions, which would vary in every age; and even those, who pretend to demonstrate them from mathematical principles, would flourish but a short period of time, and be out of vogue when that was determined."†
Chpt 3

My master said, "he could never discover the reason of this unnatural appetite, or how these stones could be of any use to a Yahoo; but now he believed it might proceed from the same principle of avarice which I had ascribed to mankind.†
Chpt 4

principle = basic rule or belief

But, instead of proposals for conquering that magnanimous nation, I rather wish they were in a capacity, or disposition, to send a sufficient number of their inhabitants for civilizing Europe, by teaching us the first principles of honour, justice, truth, temperance, public spirit, fortitude, chastity, friendship, benevolence, and fidelity.†
Chpt 4

principles = basic rules or beliefs

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)
meaning too rare to warrant focus:

See a comprehensive dictionary for more specialized senses including one in chemistry.