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Part-of-Speech (POS) Tagging

Part-of-Speech tagging is the process of reading natural language text and assigning parts of speech to each token.

One could imagine taking in a sentence like:

The dog ran away.

and creating a data structure that had the following annotations:

The[article] dog[noun] ran[verb] away[adjective].

Words can have different parts-of-speech depending on their context. For example, the word away can be either an adverb or an adjective, or part of a larger phrase.