auxiliary verb
Definition: To be required to do something or to have to do something.
Example: You need to finish your homework before going out.
intransitive verb
Definition: To require something because it is essential or important.
Example: I need to finish my homework before I can go out.
noun
Definition: A situation where something is required or wanted, often due to a lack of something essential.
Example: The charity helps people in need by providing food and shelter.
transitive verb
Definition: To require something or feel that something is necessary.
Example: She needs a new phone because her old one is broken.