Next, local and topical features are extracted from the context of the ambiguous word.
we use the current word and its part-of-speech, a local context of three words to the left and right of the ambiguous word, the parts-of-speech of the surrounding words, the verb and noun before and after the ambiguous words, and a global context implemented through sense-specific keywords determined as a list of words occurring at least three times in the contexts defining a certain word sense.