impetus

[ im-pi-tuhs ]
/ ˈɪm pɪ təs /

noun, plural im·pe·tus·es.

a moving force; impulse; stimulus: The grant for building the opera house gave impetus to the city's cultural life.
(broadly) the momentum of a moving body, especially with reference to the cause of motion.

Origin of impetus

1650–60; < Latin: an attack, literally, a rushing into, perhaps by haplology from *impetitus (though the expected form would be *impetītus; see appetite), equivalent to impetī-, variant stem of impetere to attack (im- im-1 + petere to make for, assault) + -tus suffix of v. action

Can be confused

impetus impotence sterility
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for impetus

British Dictionary definitions for impetus

impetus

/ (ˈɪmpɪtəs) /

noun plural -tuses

an impelling movement or force; incentive or impulse; stimulus
physics the force that sets a body in motion or that tends to resist changes in a body's motion

Word Origin for impetus

C17: from Latin: attack, from impetere to assail, from im- (in) + petere to make for, seek out
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012