Which sentence uses principal correctly to mean head or first?

Which sentence uses principal correctly to mean head or first?

• A. The principal reason for the delay was the weather.
• B. The principle reason for the delay was the weather.
• C. The principal ingredient is sugar in this recipe.
• D. The principle of gravity is widely taught.

Answer: (A)

Principal here means main or chief. It describes something that is the most important or the head item. In the sentence about the delay, the phrase “the principal reason” signals the primary cause, which is exactly using principal in the intended sense. The other options switch to principle, which is a noun meaning a rule or belief, not the main cause or head of something. That’s why they don’t fit this sense. One option about gravity uses principle correctly in a different context, but that still doesn’t use principal to mean head or first. The sentence about the ingredient could work with a cleaned-up phrasing—more natural would be “The principal ingredient in this recipe is sugar”—but as written, its placement is awkward, so it’s not the best demonstration of the sense in question. So the first sentence shows principal used to mean the main, most important reason.

Principal here means main or chief. It describes something that is the most important or the head item. In the sentence about the delay, the phrase “the principal reason” signals the primary cause, which is exactly using principal in the intended sense.

The other options switch to principle, which is a noun meaning a rule or belief, not the main cause or head of something. That’s why they don’t fit this sense. One option about gravity uses principle correctly in a different context, but that still doesn’t use principal to mean head or first. The sentence about the ingredient could work with a cleaned-up phrasing—more natural would be “The principal ingredient in this recipe is sugar”—but as written, its placement is awkward, so it’s not the best demonstration of the sense in question.

So the first sentence shows principal used to mean the main, most important reason.