S: (n) increase, increment, growth (a process of becoming larger or longer or more numerous or more important) "the increase in unemployment"; "the growth of population"
S: (n) process, physical process (a sustained phenomenon or one marked by gradual changes through a series of states) "events now in process"; "the process of calcification begins later for boys than for girls"
S: (n) principle, rule (a rule or law concerning a natural phenomenon or the function of a complex system) "the principle of the conservation of mass"; "the principle of jet propulsion"; "the right-hand rule for inductive fields"
S: (n) law, law of nature (a generalization that describes recurring facts or events in nature) "the laws of thermodynamics"