About

About

####Concerning or relating to a particular subject

e.g. She said something about leaving town.

e.g. He lied about his age.

####Used to show why someone is worried, excited, concerned etc

e.g. I am worried about her.

e.g. She is excited about her new book.

####In many different directions within a particular place, or in different parts of a place

e.g. We spent the whole afternoon walking about town.

e.g. Books were scattered about the room.

####If an organization, a job, an activity etc is about something, that is its basic purpose

e.g. Leadership is all about getting your team to co-operate.

e.g. The movie is all about his life.

####A little more or less than a particular number, amount, or size [About= adverb]

e.g. I live about 10 miles away.

e.g. We left the restaurant at round about 10.30.

Source:

Cambridge dictionary

Longman dictionary

Oxford dictionary