a process by which information is exchanged between individuals
Although they both talked a lot, there was no real communication because neither of them listened to the other.

the space between two points
The distance between Newcastle and Sydney is about 160 km.

to give someone or something a blow; a knock, to knock into something
The stone hit the side of the road.

of having information or having learned something
The professor's knowledge of the subject was incredibly high.

what is intended to be or actually is
Understanding the meaning to some poems can be difficult.

a piece of written or spoken information that you give or send to someone
Sue wrote a secret message to Tom.

a person given a message and sent to deliver it through running
In World War I, runners were often sent from the combat areas with information to command posts that were far from the fighting.

a cloud of tiny particles usually caused by the burning of fuel
smoke during fires can be more damaging than the fire itself.

an idea or notion
I have many thoughts about how we can improve sales.

helpful
A spoon is useful when eating soup.