(with the verb "to be") Present in the vicinity.

"Is Clare around today?"

(with the verb "to be") Alive; existing.

""How is old Bob? I heard that his health is failing."  "Oh, he's still around. He's feeling better now.""

So as to form a circle or trace a circular path, or approximation thereof.

"High above, vultures circled around."

So as to surround or be near.

"Everybody please gather around."

Nearly; approximately; about.

"An adult elephant weighs around five tons."

From place to place.

"Look around and see what you find."

From one state or condition to an opposite or very different one; with a metaphorical change in direction; bringing about awareness or agreement.

"He used to stay up late but his new girlfriend changed that around."

(with turn, spin etc.) So as to partially or completely rotate; so as to face in the opposite direction.

"She spun around a few times."

Used with verbs to indicate repeated or continuous action, or in numerous locations or with numerous people.

"I asked around, and no-one really liked it."

Used with certain verbs to suggest unproductive activity.

Defining a circle or closed curve containing a thing.

"I planted a row of lilies around the statue."

(of abstract things) Centred upon; surrounding.

"There has been a lot of controversy around the handling of personal information."

Following the perimeter of a specified area and returning to the starting point.

"She went around the track fifty times."

Following a path which curves near an object, with the object on the inside of the curve.

"The road took a brief detour around the large rock formation, then went straight on."

Near; in the vicinity of.

"I don't want you around me."

At or to various places within.

"She went around the office and got everyone to sign the card."