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Cardinal Number

Definition:

A cardinal number is a number that expresses the quantity or count of a group of objects or individuals. Cardinal numbers are used in counting, measuring, and ordering objects.

Senses:

1. Mathematics:

In mathematics, the cardinal number represents the size or cardinality of a set. It defines the number of elements in a given set.

Example: The cardinal number of the set {2, 4, 6, 8} is 4.

2. Grammar:

In grammar, a cardinal number is a word used to express quantity or count in a sentence.

Example: I have two cats; the word "two" is a cardinal number in this sentence.

Usages:

1. Counting:

Cardinal numbers are commonly used for counting objects, people, or events.

Example: There are five apples in the basket.

2. Measuring:

Cardinal numbers can be used for measuring quantities, distances, or sizes.

Example: The road is seven miles long.

3. Ranking:

Cardinal numbers are used for ranking items in order.

Example: She won the first prize in the competition.

4. Identifying:

Cardinal numbers are used to identify items when there is a specific amount or count.

Example: The train departs at platform number 3.

Sample Sentences:

1. Mathematics:

1. The cardinal number five represents the quantity of fingers on a hand.
2. There are infinite cardinal numbers in the set of real numbers.

2. Grammar:

1. I bought three books from the store. (Three is a cardinal number.)
2. She received a perfect score of ten in the exam. (Ten is a cardinal number.)

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