What is the definition of word the?

The word "the" is a definite article, meaning it specifies a particular noun or group of nouns. It's one of the most common words in the English language and has a few key functions:

1. Identifying a specific noun:

- "I ate the apple." (Specifies a particular apple, not just any apple)

- "Let's go to the beach." (Specifies a specific beach, not any beach)

2. Making a noun definite:

- "The sun is shining." (Indicates a specific and unique sun)

- "The Earth revolves around the sun." (Specifies the planet Earth and the sun)

3. Referring to something already mentioned:

- "I saw a dog. The dog was brown." (The second sentence refers to the dog mentioned in the first sentence)

4. Indicating a noun that is unique or understood:

- "The President of the United States." (There's only one President, so we use "the")

- "I went to the store." (We assume the listener knows which store)

5. Used with superlatives:

- "He is the tallest person in the class." (Indicates the highest degree of tallness)

6. Used with ordinal numbers:

- "The first person to arrive." (Indicates the first in order)

In essence, "the" makes a noun specific, identifiable, and known. It's a powerful word that plays a vital role in making English clear and precise.