prep·o·si·tion 
/ˌprɛpəˈzɪʃən/ noun
plural prep·o·si·tions /ˌprɛpəˈzɪʃən/ noun [count] grammar : a word or group of words that is used with a noun, pronoun, or noun phrase to show direction, location, or time, or to introduce an object
▪ The preposition “on” in “The keys are on the table” shows location. ▪ The preposition “in” in “The movie starts in one hour” shows time.
▪ The preposition “on” in “The keys are on the table” shows location. ▪ The preposition “in” in “The movie starts in one hour” shows time.
