impetus
Other forms: impetuses
An impetus is the force behind something, whether it's a boulder rolling down a hill or a person making a decision.
Very little would get done if there were no such thing as an impetus: an impetus is some kind of force that gets something or somebody moving. If you push a car that's out of gas, you're the impetus that's getting it moving. An impetus doesn't have to be physical. Advertisers hope their commercials will be an impetus to buy the product.
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Vocabulary lists containing impetus
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As you read John F. Kennedy's "Remarks at the Dedication of the Aerospace Medical Health Center," learn this word list. Here are links to lists for texts in Grade 7's Collection 4: Dedication of the Aerospace Medical Health Center, Mankind's Next Giant Leap, Living in the Dark, Your World
Mariam and Laila belong to different generations, but they develop a deep bond as their home city of Kabul, Afghanistan becomes more dangerous.