1) Attempt 2) Effort 3) Effort or impulse 4) Endeavor 5) Endeavor toward a goal 6) Endeavour 7) Exertion 8) Impulse 9) Pains 10) Strain 11) Striving 1) Jihadi 2) Pains 3) Striving 4) Tendency 
effort; striving; impulse
• (n.) A striving; an effort; a conatus. • (n.) A striving; an effort; a conatus. • (n.) The periodic procreative desire manifested in the spring by birds, etc. • (n.) The contraction of the diaphragm and abdominal muscles to evacuate feces or urine.
in Greek mythology, king of Megara, a son of King Pandion of Athens. His name was given to the Megarian port of Nisaea. Nisus had a purple lock of ...
Ni'sus noun (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. 
nisus 1. A striving, exertion, effort; an attempt or effort to accomplish an aim or goal. 2. Any strong effort or struggle.
The creative principle of emergent evolution. See Emergent Evolution. -- R.B.W.
an effort or striving toward a particular goal or attainment; impulse.