What is the meaning of Nisus?

A mental or physical effort to attain a specific goal; a striving.

The periodic procreative desire manifested in the spring by birds, etc.

The contraction of the diaphragm and abdominal muscles to evacuate faeces or urine.

inessive singular of nisu

pressure (downward push)

exertion

alternative form of nīxus

sea-eagle

sparrowhawk

Source: wiktionary.org