[ni.sus] n, pl ni.sus [L, fr. niti to lean, rely, strive; akin to L nictare to wink--more at connive] (1699): a mental or physical effort to attain an end: a perfective urge or endeavor
NISUS
Meaning of NISUS in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012