restrictiveness a grammatical qualification that makes the meaning more specific (`red hat' has a more specific meaning than `hat')
modification -
slightly modified copy; not an exact copy; "a modification of last year's model"
copy a thing made to be similar or identical to another thing; "she made a copy of the designer dress"; "the clone was a copy of its ancestor"
modification -
an event that occurs when something passes from one state or phase to another; "the change was intended to increase sales"; "this storm is certainly a change for the worse"; "the neighborhood had undergone few modifications since his last visit years ago"
vagary an unexpected and inexplicable change in something (in a situation or a person's behavior, etc.); "the vagaries of the weather"; "his wealth fluctuates with the vagaries of the stock market"; "he has dealt with human vagaries for many years"
fluctuation,
variation the quality of being unsteady and subject to changes; "he kept a record of price fluctuations"
conversion a spiritual enlightenment causing a person to lead a new life
development act of improving by expanding or enlarging or refining; "he congratulated them on their development of a plan to meet the emergency"; "they funded research and development"
revolution the overthrow of a government by those who are governed