Definitions

1. preposition

in favor of; on behalf of; intended for a particular person, place, or purpose; in a specified direction or position

“I’m writing this letter for my mother.”

2. adverb

in the direction of; towards; on the side of; for the purpose of

“The road goes for miles without any traffic lights.”

3. conjunction

because; since

“I’m tired, for I didn’t sleep well last night.”

4. noun

a period of time during which something is valid or effective; a period of time for which a person is responsible

“The promotion is valid for a year.”

5. adjective

used to describe a type of person or thing that is intended for a particular purpose or audience

“a book for children”