parts of speech
Definition - According to traditional English grammar — which is modelled on Latin Grammar, which was modelled on Greek grammar — English has eight types of words: noun, verb, adjective, adverb, pronoun, preposition, conjunction, and interjection. These constitute the parts of speech.

1. Modern linguists finds this classification model insufficient and simplistic — some even think it's dopey — but it is still an extremely popular way of analyzing and discussing the English language.
2. The notion that there are eight categories of speech originates from a list made by the grammarian Dionysius Thrax in about 100 BCE. Thus the original eight parts of speech were suited to Greek, not to Latin or English.

Etymology -
The phrase parts of speech was coined in the 16th century as a translation of the Latin pars orationis, a part of discourse. The Latin phrase was itself a translation of the Greek meros tes lexeos (Aristotle's term) and meros logou (Thrax's term).

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