B1
in grammar, a word which is used before a noun, a noun phrase or a pronoun, connecting it to another word
Dictionary examples:
The teacher danced on the table to demonstrate the preposition 'on'. (0.0)
My cat thinks 'on' is the only preposition and sits on everything. (0.0)
I lost weight by running from one preposition to another in my textbook. (0.0)
In the sentences "We jumped in the lake," and "She drove slowly down the driveway," "in" and "down" are prepositions. (65.3)