bit
1 Americannoun
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Machinery.
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a removable drilling or boring tool for use in a brace, drill press, or the like.
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a removable boring head used on certain kinds of drills, as a rock drill.
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a device for drilling oil wells or the like, consisting of a horizontally rotating blade or an assembly of rotating toothed wheels.
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the mouthpiece of a bridle, having fittings at each end to which the reins are fastened.
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anything that curbs or restrains.
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the blade or iron of a carpenter's plane.
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the cutting part of an ax or hatchet.
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the wide portion at the end of an ordinary key that moves the bolt.
verb (used with object)
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to put a bit in the mouth of (a horse).
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to curb or restrain with, or as with, a bit.
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to grind a bit on (a key).
idioms
noun
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a small piece or quantity of anything.
a bit of string.
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a short time.
Wait a bit.
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Informal. an amount equivalent to 12½ U.S. cents (used only in even multiples).
two bits; six bits.
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an act, performance, or routine.
She's doing the Camille bit, pretending to be near collapse.
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a stereotypic or habitual set of behaviors, attitudes, or styles associated with an individual, role, situation, etc..
the whole Wall Street bit.
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Also called bit part. a very small role, as in a play or motion picture, containing few or no lines.
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any small coin.
a threepenny bit.
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a Spanish or Mexican silver real worth 12½ cents, formerly current in parts of the United States.
idioms
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bit by bit, by degrees; gradually.
Having saved money bit by bit, they now had enough to buy the land.
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do one's bit, to contribute one's share to an effort.
They all did their bit during the war.
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a bit, rather or somewhat; a little.
a bit sleepy.
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a bit much, somewhat overdone or beyond tolerability.
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every bit, quite; just.
every bit as good.
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quite a bit, a fairly large amount.
There's quite a bit of snow on the ground.
noun
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Also called binary digit. a single, basic unit of digital information that is represented by one of two values, such as 1 or 0, True or False, or Yes or No.
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the amount of computer memory required for storing such a unit of information, consisting of one of a series of identical physical components that can assume either of two states corresponding to one of two values.
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baud. a unit used to measure the speed of signaling or data transfer, equal to the number of pulses or digital bits per second.
bit rate.
verb
abbreviation
noun
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a small piece, portion, or quantity
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a short time or distance
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informal the value of an eighth of a dollar: spoken of only in units of two
two bits
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any small coin
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short for bit part
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informal way of behaving, esp one intended to create a particular impression
she's doing the prima donna bit
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rather; somewhat
a bit dreary
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rather
a bit of a dope
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a considerable amount
that must take quite a bit of courage
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slang a sexually attractive woman
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gradually
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informal an extramarital affair
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to make one's expected contribution
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(foll by as) to the same degree
she was every bit as clever as her brother
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not in the slightest; not at all
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completely apart
to fall to bits
noun
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a metal mouthpiece, for controlling a horse on a bridle
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anything that restrains or curbs
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to undertake a task with determination
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to rebel against control
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a cutting or drilling tool, part, or head in a brace, drill, etc
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the blade of a woodworking plane
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the part of a pair of pincers designed to grasp an object
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the copper end of a soldering iron
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the part of a key that engages the levers of a lock
verb
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to put a bit in the mouth of (a horse)
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to restrain; curb
noun
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a single digit of binary notation, represented either by 0 or by 1
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the smallest unit of information, indicating the presence or absence of a single feature
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a unit of capacity of a computer, consisting of an element of its physical structure capable of being in either of two states, such as a switch with on and off positions, or a microscopic magnet capable of alignment in two directions
verb
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The smallest unit of computer memory. A bit holds one of two possible values, either of the binary digits 0 or 1. The term comes from the phrase binary digit.
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See Note at byte
Discover More
The information in a digital computer is stored in the form of bits.
Other Word Forms
Etymology
Origin of bit1
First recorded before 900; Middle English bit(t)e, bit, bete “a strike or hit, a blow with a sharp weapon; the blade, tip, or point of a weapon,” Old English bíte “bite, pain, biting pain of a wound”; cognate with German Biss, Old Norse bit; see origin at bite
Origin of bit2
First recorded before 1000; Middle English bite “a bite, mouthful, portion,” Old English bita “bit, morsel, fragment”; cognate with German Bissen, Old Norse biti; see bite
Origin of bit3
Explanation
Let me give you a bit of advice: Use bit when you're talking about a small amount. Bit is a small but useful word. Like drill bits, which fit on the end of a drill to change its function, the word bit has several uses. Usually, it means a little piece of something, even time. If you ask me when I'm arriving, I might say, "In a little bit." A bit can also be a short theatrical entertainment, the metal piece a horse bites on, or digital information that's 1/8 the size of a byte.
Vocabulary lists containing bit
Computer Science and Technology - Middle School
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Computer Science and Technology - High School
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
In her post, Mcallister said: "He was in a bit of an unsteady state due to medication and heat."
From BBC ● Aug. 16, 2026
Still, that particular bit of alchemy never gets old to me.
From Salon ● Aug. 16, 2026
To be sure, there is reason to allow for a bit of leeway here.
From MarketWatch ● Aug. 16, 2026
“So, it’s a bit like a whack-a-mole kind of story.”
From The Wall Street Journal ● Aug. 16, 2026
Marcie offered parting words, but see you later came out like she was a bit disappointed.
From "Legendary Frybread Drive-In" by Cynthia Leitich Smith
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“A big dog done bitted him all up!” cried Mildred.
From Molly Brown's College Friends by Nell Speed
So bitted as to enable the cable to be nipped or rendered with ease.
From The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. by Sir Edward Belcher
His poor, underfed horse, in reaching for the grass near his bitted mouth, had drawn the reins beneath his hoofs and was about to break them.
From The Cottage of Delight A Novel by Will N. (William Nathaniel) Harben
The Nestor spoke—the colt submitted— And, like his ancestry, was bitted.
From Fables of John Gay (Somewhat Altered) by John Gay
The old man was pale and silent, and Ben Butler felt the lines telegraphing nervous messages to his bitted mouth; but all he heard was: “Shiloh—Cap'n Tom—Steady, old hoss!”
From The Bishop of Cottontown A Story of the Southern Cotton Mills by John Trotwood Moore
"Why, there's for you; and there, and there!" said Sebastian, bitting back a great deal harder, and again and again, till Sir Toby came to the rescue of his friend.
From Beautiful Stories from Shakespeare by E. (Edith) Nesbit
It is true, he was on the whole rather an innocent monster; and between bitting and bridling, coaxing and humouring, might have been made to pad on well enough.
From St. Ronan's Well by Sir Walter Scott
So the Pyrenees, with her cargo of fire, was hove to, bitting the teeth of the gale and fighting and smashing the pounding seas.
From South Sea Tales by Jack London
He had thought and read to some purpose, for he ruled the lay brothers with diligence, and instructed the monks with great care, stirring up the sluggish and bitting the heady into restfulness.
From Hugh, Bishop of Lincoln A Short Story of One of the Makers of Mediaeval England by Charles L. (Charles Latimer) Marson
A little shadow passes over my mind as I think of the analogy to bitting a horse.
From Revisiting the Earth by James Langdon Hill
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.