In natural language processing a tagger adds additional information to words or groups of words. One example is a part-of-speech tagger that adds tags such as 'noun phrase'. Taggers might also add semantic information, such as identifying {{named entities}] such as places or people.
Used in Chap. 13: page 196
Example output of CLAWS WWW tagger with three meanings for ‘base’. Note that the tagger copes with the typing error ‘by’