Part of Speech

A grammatical category assigned to each word (or, in signed languages, each sign) in a sentence — such as noun, verb, adjective, adverb, pronoun, preposition, or conjunction. Automatic part-of-speech tagging is a foundational step in natural language processing pipelines. In accessibility technology, POS information is used by text-simplification systems (which may replace complex words of a given class with simpler synonyms), screen-reader prosody engines (which adjust intonation based on word class), and sign-language animation systems (which apply different timing rules to content signs such as nouns or verbs than to grammatical function signs).