A bike is a pedal-powered two-wheeled vehicle. If you don't have time to walk to work, you might decide to ride your bike instead.

Bike is shorthand for a bicycle or a motorbike. A bike enthusiast might keep a bike rack on her car and a bike helmet in her trunk at all times. Bike is also a verb, so you could say: "I'll bike over to the movie theater — meet you there in fifteen minutes!" This word, as a nickname for bicycle, first appeared in American English in 1882. It came to mean "motorcycle" about 50 years later.

Definitions of bike
  1. noun
    a wheeled vehicle that has two wheels and is moved by foot pedals
    synonyms: bicycle, cycle, wheel
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    bicycle-built-for-two, tandem, tandem bicycle
    a bicycle with two sets of pedals and two seats
    all-terrain bike, mountain bike, off-roader
    a bicycle with a sturdy frame and fat tires; originally designed for riding in mountainous country
    ordinary, ordinary bicycle
    an early bicycle with a very large front wheel and small back wheel
    a bicycle that must be pedaled
    safety bicycle, safety bike
    bicycle that has two wheels of equal size; pedals are connected to the rear wheel by a multiplying gear
    any of several early bicycles with pedals on the front wheel
    type of:
    wheeled vehicle
    a vehicle that moves on wheels and usually has a container for transporting things or people
  2. noun
    a motor vehicle with two wheels and a strong frame
    synonyms: motorcycle
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    minibike, motorbike
    small motorcycle with a low frame and small wheels and elevated handlebars
    dirt bike, scrambler, trail bike
    a lightweight motorcycle equipped with rugged tires and suspension; an off-road motorcycle designed for riding cross country or over unpaved ground
    a motorbike that can be pedaled or driven by a low-powered gasoline engine
    type of:
    automotive vehicle, motor vehicle
    a self-propelled wheeled vehicle that does not run on rails
  3. verb
    ride a bicycle
    synonyms: bicycle, cycle, pedal, wheel
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    ride a unicycle
    pedal backwards on a bicycle
    type of:
    be carried or travel on or in a vehicle
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