"function word." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/function-word>.
function word. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/function-word
(plural function words)
(linguistics) A word that has little meaning when standing alone, but instead serves to express grammatical relationships with other words within a sentence, or specify the attitude or mood of the speaker, such as prepositions, pronouns, auxiliary verbs, or conjunctions.
English Wiktionary. Available under CC-BY-SA license.