Search Result for "conservation of momentum":
Wordnet 3.0

NOUN (1)

1. the principle that the total linear momentum in a closed system is constant and is not affected by processes occurring inside the system; 



WordNet (r) 3.0 (2006):

conservation of momentum
    n 1: the principle that the total linear momentum in a closed
         system is constant and is not affected by processes
         occurring inside the system