Search Result for "nisus": 
Wordnet 3.0

NOUN (1)

1. an effortful attempt to attain a goal;
[syn: striving, nisus, pains, strain]

The Collaborative International Dictionary of English v.0.48:

Nisus \Ni"sus\, n. [L., fr. niti, p. p. nisus, to strive.] 1. A striving; an effort; a conatus. [1913 Webster] A nisus or energizing towards a presented object. --Hickok. [1913 Webster] 2. (Physiol.) (a) The periodic procreative desire manifested in the spring by birds, etc. (b) The contraction of the diaphragm and abdominal muscles to evacuate feces or urine. [Webster 1913 Suppl.]
WordNet (r) 3.0 (2006):

nisus n 1: an effortful attempt to attain a goal [syn: striving, nisus, pains, strain]