conatus | An Elementary Latin Dictionary

conatus
cōnātus, ūs, m. [conor]. I Abstr., an effort, exertion, struggle, endeavor : ne ista hercle magno ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
Conatus
·noun A natural tendency inherent in a body to develop itself; an attempt; an <<Effort>>. ...

Webster's Dictionary of the English Language