Disambiguation is the process of working out whch of a number of ambiguous meanings is correct. For example, in natural language processing the word "bow" in text could mean the wepan, the act of bending or the front of a ship; one might use the semantic simlarity with other words close in the text to disambiguate which is correct.
Defined on page 541
Used on Chap. 6: page 124; Chap. 13: pages 304, 312; Chap. 15: page 361; Chap. 22: page 541