A position of power or influence, or a way to get it.

“His parents got him an in with the company.”

(chiefly in the plural) One who, or that which, is in; especially, one who is in office.

The state of a batter/batsman who is currently batting; see innings.

To enclose.

To take in; to harvest.

Located indoors, especially at home or at one's office or place of work.

“Is Mr. Smith in?”

Located inside something.

“Little by little I pushed the snake into the basket, until finally all of it was in.”

(of the ball or other playing implement) Falling or remaining within the bounds of the playing area.

“If the tennis ball bounces on the line then it's in.”

At or towards the interior of a defined space, such as a building or room.

“He ran to the edge of the swimming pool and dived in.”

Towards the speaker or other reference point.

“For six hours the tide flows in, then for another six hours it flows out.”

So as to be enclosed or surrounded by something.

“Bring the water to the boil and drop the vegetables in.”

Used to indicate location, inclusion, or position within spatial, temporal or other limits.

Into.

“Less water gets in your boots this way.”

Used to indicate limit, qualification, condition, or circumstance.

“In replacing the faucet washers, he felt he was making his contribution to the environment.”