Humpty Dumptyism Meaning

(idiomatic) The practice of insisting that a word means whatever one wishes it to.

Example: 2003, J. A. Keats, Norman Cliff, Ordinal Measurement in the Behavioral Sciences (page 31) [1]
  "It seems to be saying one or both of two things. One is that any score that comes out of any procedure that purports to measure intelligence is a value of the scale, intelligence. If so, this would be Humpty Dumptyism."