As a noun:
* The best part of the movie was the ending.
* She only ate a small part of her dinner.
* My favorite part of the day is reading a book.
* He played a key part in the company's success.
* The park is divided into different parts for different activities.
As a verb:
* The mechanic parted the engine to fix the problem.
* The couple parted ways after five years.
* She parted her hair down the middle.
As an adjective:
* The part-time job was only for a few hours a week.
* We have a part-time employee who works on weekends.
As a preposition:
* This is a gift for you, part of your birthday present.
* He was part of the team that won the championship.
The meaning of "part" will depend on how it is used in the sentence.