bit

An indefinitely short time.

“in just a bit”

The cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press.

“he looked around for the right size bit”

The part of a key that enters a lock and lifts the tumblers.

A small fragment.

A small amount of solid food; a mouthful.

“all they had left was a bit of bread”

A small piece or quantity of something.

“a bit of paper”

“a bit of lint”

A short performance that is part of a longer program.

A small fragment of something broken off from the whole.

“a bit of rock caught him in the eye”

An instance of some kind.

“he had a bit of good luck”

A unit of measurement of information (from binary + digit); the amount of information in a system having two equiprobable states.

“there are 8 bits in a byte”

Piece of metal held in horse's mouth by reins and used to control the horse while riding.

“the horse was not accustomed to a bit”